Not worth it. Since the dev is making this game only during his free time (as he clearly said), I even stopped pledging. Since this is only a hobby for the dev and not an actual job, is only fair to not give him a single penny.
It's obvious from your posts that you are very bitter toward this Dev. Maybe you should try a different game...or make your own. You apparently already know what not to do... just make sure you quit your day job first, otherwise it won't be fair to expect any supporters to give you even "a single penny"... because it's not fair for a dev who isn't full time to make money off his project.
In the same way that it isn't fair for an amateur golfer to keep the cash prize if he wins a tournament, or for anyone other than a professional gambler to win the lottery.
If your neighbor's hobby is restoring classic cars, then it's only fair not to give him a single penny for using his time and tools to fix your car when it breaks down, you should probably even make him buy the parts as well, since it's his hobby.
Having a "steady job" doesn't mean that everything else you do in life should be done for the free benefit of others. Your "hobby" premise is crap.
If you are frustrated and no longer want to support someone, fine, don't support them.
But don't say its because the dev doesn't deserve to profit from his work since its only a hobby. My coworker raises chickens as a hobby (she has around a hundred of them). The eggs she sells pay her car payment each month.