It wouldn't be economically feasible to have an older camera repaired, especially if a newer/better camera could be had for little more money, and you certainly wouldn't get your money's worth out of it if you tried to sell it later. But then I do this all the time, because I like the camera in question. The money just doesn't enter into it for me.

I had some shutter repair done last year on a couple of EOS 630, more expensive than the cameras are worth, but they're great cameras and they'll last me years yet.