Some years ago I had a business doing techno raves and I hardly made any money from it. (lots of beers and girls though) Then I started doing boring stuff, and I realised something important:
The more interesting or cool a niche is, the more people will flock to fill it. Which results in lower income for each business owner. Just look at artists, musicians and DJ's. Lots of girls, fun and beer. But on average, not a lot of money.
On the contrary I know people that are in the furniture moving business that make insane amounts of money. Why? Because it is a shitty business and nobody wants to do it.
Basically it's about supply and demand - the more people that want to pursue a career in a given niche the less the average businessowner will make in that niche.
So you should all stop doing ultracool social network apps and start doing boring ERP systems. If you want to make money that is. ;-)