[quote:3tky8dub] ... and put ads in.
That, right there, will keep me from buying your game and I'll inform my friends as well. Why? No offense to your personally, but I don't buy games to be assailed with ads. I buy them to enjoy the game. I see more than enough ads on a daily basis just surfing the web.
Your game should stand on it's own IMHO. If it's good, then people will buy it and you'll see a profit. If it's not, then you can learn from the experience and improve your game, or your coding. The irony is this: if your game isn't selling well anyway, no amount of ads will generate any appreciable money for you. Ads sell on quantity.
Cheers.