Wow, are you kidding me? 100k a month? That is insane! I knew if you had a really popular blog you could make good money, but 100k a month?! That is a year’s salary for doctors. I am a blogger myself and make no where close to that. I make enough for a living in hope of some day catching up to you. You instilled a little bit of fire in me, knowing that there is someone achieving the impossible.
PS: my answer to this question is always… “the better question is… how can my blog help me build a profitable business?” Most of the profits from blogging are not made on your blog, but that’s okay. I don’t believe blogging about making money per se, but about branding yourself and positioning yourself within your niche market as an authority and leader. Once that is established, there are so many ways to move people into your money making enterprises. Email marketing, as you pointed out, is one of the best ways to do this. Sending people to your membership sites, services, info products and coaching programs are all great things to route people into as well.
I went ahead and joined the Amazon affiliate program, but even though I get numerous clicks, there haven’t been any conversions, yet. Because of this, I might get dropped, but you can always re-apply later. I just don’t have enough traffic, yet. If I had to do it all over again, I would not have signed up for a program with time limits so soon. It feels like artificial pressure. I have three other affiliates; all of them relate to my blog content.
If you want to be successful and really grow the ways you are making money from a blog, then you may want to look into buying ebooks and/or courses that will teach you exactly what to do, so that you can minimize the amount of blogging mistakes you make and learn how to run a successful blogging business from the very beginning. Plus, there are many blogging secrets that you just can't find by searching the internet. So, by taking a course or reading an ebook, you will learn exactly what you have to work on.
If you want to be famous or reach a wide audience, you will have to choose something slightly broader and work hard to make the best content for that topic. A subtopic relating to fitness, finance, or relationship advice is likely to reach the most people. Consider specific but broadly applicable topics such as managing money in college, or a marriage counseling blog. 

Perhaps the most popular network for placing these types of ads is Google AdSense. With this program, you do not need to be in direct contact with advertisers; you simply place the banner on your site, Google chooses ads relevant to your content, and your viewers click on the ads. There are countless similar programs available if you find that AdSense doesn’t work for you, such as Chitika, Infolinks, and Media.net.
Make it easy. My blog name isn't the easiest for a person to spell, and even I sometimes jumble it when I'm spelling it to someone. So, my top tip would be to make sure that it is easy to type. I've seen blog names that are extremely long, contain words that are difficult to spell, and so on. Instead, you should make it as easy as possible for your readers.

At the time of this writing, I’ve been blogging for only 1 1/2 years. And most of that time I spent on my podcast and writing my book – not blogging. And yet one day I realized – hey, I can make money blogging! The last time I published my monthly online income, my blog made $40,560.20.  You can find out more reading my income reports. And I don’t say that to brag, but to show you, you can do it.
Within a month, I had On Moneymaking off the ground, and within two months, it was getting 2,000 visitors a day and Performancing nominated it for the best business/money blog of the year. A couple of months after that, Brian Clark asked me to become the Associate Editor of Copyblogger, and so I sold On Moneymaking for five figures and went to work at one of the most popular blogs at the world.
Lets say, for example, that you refurbish and resell used smartphones out of your home. You could use a blog to attract visitors to your website where you list your current phones for sale. Your blog might cover topics about DIY refurbishing. On one level, it seems counterintuitive because you want people to buy your phones, but it also helps you build a brand and gain recognition. Social media guru Jay Baer explains the concept on Copyblogger:
Find something that other people are interested in, too. If you choose to write about Himalayan basket weaving for men, you probably won’t have many readers, and you’ll have a hard time earning any income. Try to find something that combines your interests with things other people also care about. For my main blog, I write about money advice. I’m a personal finance nerd but, fortunately, there are people online looking for that type of information, too.
If your niche doesn’t allow you to promote or build premium products (anything over around $100 per unit) then think about getting a solid mix of offerings and building it up over time. I remember Darren Rowse saying that initially Amazon Associates was a really small source of income but over the years it has really started to add up. Think eBooks, affiliates, consulting, books, etc. and you’re starting to build an income stream. 
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