What do you think the most stable internet investment is?

So, I've just figured out how to make my stable $100 income a day from internet marketing, after 4 years of learning and working 8-10 hours a day on my countless websites and strategies.

My question now is for the more experienced people than me, who can make more than $100 a day.
What kind of internet investment do you put your trust the best on?

I'm considering to move from my mother's house to the big city and build my startap company there. But first I want to reach the point that I…

What do you think the most stable internet investment is?