I haven't thought about this before, so it might be my thoughts would evolve further if I thought about it more. But after I considered it for a moment, I would

I haven't thought about this before, so it might be my thoughts would evolve further if I thought about it more. But after I considered it for a moment, I would pay for it if I got the source with it, and a license to publish that source under a BSD-Like License if support for it was going to end. As others have mentioned, the idea of it getting dumped when it turns out it isn't worth the effort, would put me off. If the price was low enough, and the software simple enough, I might be willing to relax some of those conditions. For example, I have payed a couple of bucks for a simple pixel graphics editor, for which I was ok with the prospect that this is a toy I play with a little and then would likely drop.