Actually, there is many people who sold there games. But, the only way you could have sold it is, that the game is completely original. Currently, they are common in the RM world, best examples would be from japan. You need to overcome all awesome free RM games out there. Master of the Wind, Quintessence, Ethereal Dreams, etc. Examples of commercial games would be, The Lost Element, and another one I forgot.
Cassius, I don't want to discourage you in selling your game. You should think about it, before just saying that you will sell your game.