Why shame? We're not really talking about endless repetition, we're talking about actual improvements, however minute, and changes that make the game playable on new iOS versions/device.

It is great if you can make something new, but if you can't, and have a good idea on how to improve something old, I say go for it. We need that too.

The problem of EA/Activision/Zynga is that they take ideas, make almost no improvements, and then use their marketing power to come on top anyway.