Ebay and your opinions...

Alright. I guess I can hit two birds with one stone here. I am asking 2 questions.
1) my daughter found the Tory Burch shoes at Ebay for a cheap (or at least reasonable) price in her size. Can I trust ebay? Do you think that shoes from their are worth getting, even if they have been worn. Do you think that Ebay sellers will be giving me good quality shoes in good quality? My first thought is, why would they be selling these shoes in the first place? But…from past experiences, is it worth it?
2) ok..secondly. Do you think it is acceptable for girls who are 13 to be wearing $500 shoes?I am not going to spoil my children, but I am considering this for their birthday. Maybe this is spoiling them, I agree, I don’t think it’s acceptable for girls to wear very expensive shoes but I just want to hear you opinions. Maybe they aren’t the well known, Tory Burch flats with the gold emblem, maybe it’s Coach or another fancy expensive brand. I don’t want to spoil my kids, but for those of you who do, or feel, do you think its acceptable? And, your answer doesn’t have to reflect my situation here. I am just asking in general what you think. And, please, please, please no rude comments! Thank you!