I don't often get asked but I'm still happy to check out problems with PCs of acquaintances who I sort of know for free, it's experience apart from earns good will IME. Last time, someone I didn't particularly know, storage external hard drive on its way out, simple matter of copying off it, telling them to buy a new one, and putting it on the new one, and she gave me £20 of vouchers and some beer. Very nice, especially as I wasn't expecting anything other than a thank you 
