And i'm practicing for ~10 Years now. And i am feared of making an RTS...
It's a really hard piece, if you want to do it all yourself, so again think about wasting time with programming a RTS
Do something easier and try to sell this
If you really want to make money with games, have a new idea, don't copy old stuff and try to improve it. You can't get better than all of the games which are sold today.
You need something what makes your game interesting to others. Your game has to be unique to get money with it.
Simply take a look at minecraft. It's a sandbox game with an "unlimited" world. You can build what you want or you can play some survival. Minecraft is a mixture of RPG, Fighter, Sandbox, Open World and Survival Game. There was nothing like this before.

I'm thinking about redoing an old game, which many people played for hours and weeks. This game has a really good rating (sometimes 95/100), altough the game was buggy as hell, crashed every 20 minutes. It was the concept of the game which made it special. But afaik it's the only game with this style.

Think about it...

EDIT:

7% of all games published per year are shooters....