I'm planning on selling my Ibanez to help fund for an 8 string Agile, and I need to know whether its worth fixing it's problems.
First:

I overtightened one of the screws shortly after getting the guitar and destroyed the thread, thus needing pliars to sort it out. This means the D and G strings don't lock fully. Should I pay the £25 or so for a new locking nut, will I make it back?
Secondly:

Scratches on the back of the guitar, were there when I bought it, can these be buffered out or something? They don't go down to the paint, pretty shallow actually.
Bare in mind this guitar was £425 new and completely flawless otherwise.