It’s always fun when you read in indiegamer forums newbies asking for useless advice, like how to save 20$ on payment methods, if that game clone of X would sell, if is better to use OpenGL or DirectX, etc etc
Those questions have really simple answers: work instead of asking and you’ll discover it yourself.
If you worry to save 20$ on a wire transfer, how much you think you can earn from the game you make? 200$ a month? then better give up no? 🙂
If you waste time asking if game clone of X can sell, you would better spend that time finishing the game or thinking about a more original ideas…
At last, doesn’t matter if your game uses OpenGL or DirectX… there are plenty of OpenGL games that sells very well, and plenty of DirectX 7 games that sold crap. What it count it’s the game, if it is fun or not.

Note: I’m not criticizing those people, as only 2 years ago I was like them. Then I discovered the hard way that the best thing is to work and not ask questions (well, not always ask question on anything!).