You're probably right, and I've repaired so many over the years that I've started to run out of friends and family to give them to. I get so much out of the actual repair work that I don't feel like I'm losing out on anything, but your comment has got me thinking that it's something that could be valuable charity. I'll look for a proper place to donate. Thanks for the suggestion.
Sweet. I think there's a business model in here somewhere...