Checked with Apple on the GPU crashing? There's been recall/repair programs for that kind of thing over the years, might as well check it out. Otherwise check eBay for loose comparables, I bet a 2010 can still net some decent money (barring the whole GPU crashing thing) cause as long as it's still working it's still decent enough for a lot of usage. The main thing to remember is that the other option for people is a newer or new machine, the resale value is usually good cause Apple keeps the baseline high.
Anyway personally I've been using Mac minis (which have ridiculous resale value at times cause there's not much room to move down from), so they're easy to keep around. My 2006 went from my work machine, to my mom's work machine, to my server machine. That'll be its last tour of duty (cause it's been long out of software support), just waiting on a new mini to replace it went day. I have a 2009 model that is now my HTPC/DVR, another 2009 that became my work machine, and my current main one from 2011...which I'm sure will figure out some use for if not just replace one of the older ones.
If I had any other Mac I think I'd sell them off or give them to family probably (hell same with the minis at some point, I'm reaching Mac mini saturation!), maybe set one up as a guest machine for anyone to use. I had my brothers old MacBook just in the kitchen for years like that. Everyone has phones or tablets now so it's not as useful, but a desktop OS comes in handy now and then.