If he is going to buy it, why would it matter? If I buy angry birds and play it for 5 hours and somebody else pirates it, plays for 2.5 hours, buys it, and plays for another 2.5 hours, then the developer profits either way.
For example, Notch (Creator of Minecraft), was asked on twitter by somebody who did not have the money to buy minecraft, and asked him what to do. Notch replied "Just pirate it, and buy it when you have the money" Developers want their programs to be used. Yes, there are dev's that are in it for the money and say "No money? Too bad", but for the most part, they want their work to be acknowledged -even if they have to give a "free trial" per sé- until the consumer has the money.
Advice for OP: I've been in your same boat, was a pirate, but the hassle became a bit much. I would heavily suggest just restarting from new. A fresh iPad restore from ITunes, no backup. You'll have to individually download each app again, but the effort will be worth it in the long run.
Still he charges for Minecraft instead of just making it free and tell people to donate if they like it. Also, he's not saying "just pirate it", but rather "pay me later". It's actually a terrible example of a dev that is not in it for the money, especially considering the amount he has already made and how very, very uninterested he is in having money.