It's hard to say why I donated. To be honest I donated to keep the project alive. That's all.

Opensource is a way to guarantee that when the developer quits the project still continues.

On the other hand, if the first version (matching all the criterias required in the bounty and working, that is important) is released as open source, and the further updates are released as commercial - well, that is fine with me.

Can't say there are too many projects to spend my money on, so I think I can cope with it.