Just keep it, so long as your going to use it though.
Depending how you see things, value of something is up to perception. However I see some pretty good value in the quality of images those things take. It wouldn't matter to me how much 'x' camera etc is to buy/sell, if I love it I'll use it and just get it serviced if need be. If my old Canon AE-1 stopped working, I'd get it fixed just because.