It's about neither your extension nor your incentives, and you can be the nicest person on earth (and I have no reason to believe otherwise, great work!), but we are all mortals in the end, and with the automatically updating extensions, it's too hard to say what will happen in the long term (who takes over eventually?). Also a parallel risk which has less to do with the ad industry is the extension getting hijacked.

So there is always a significant risk even the author declines all the offers for cashing out.

But again, your awesome extension in which you poured so many hours is not the problem, it's just affected by the problem.