I don't understand.. Are you just copying/renaming apps or making completely original/new apps?
If you make an app from scratch it will cost you tons of money. So you're just buying code and making simmilar app with different graphics/name, and if you can afford it you can also make some changes in the game programming and gameplay (if it's a game)
What do you mean it will cost a ton of money? Are you assuming that most don't know how to write apps and are buying help on coding/recoding it?
Thanks