I wonder why no one has come up with a try-before-you-buy download option. First X levels are free, next Y levels are $0.25-$0.50 (assuming the full cost of the

I wonder why no one has come up with a try-before-you-buy download option. First X levels are free, next Y levels are $0.25-$0.50 (assuming the full cost of the game is $1, adjust accordingly), the rest of the levels are the remaining price of the same. For a casual game a model like this would be a good way to get a decent amount of revenue from anyone that likes the game but may not be completionist or get bored with it at some point. Then, in the rare instance that you have a hit game, you can further supplement it with paid DLC for extra levels that you have to own the base game for.