About 3 years ago i sold a pair of glastonbury tickets for £425, its good money but your fucked if you over buy or they have some sort of identification process (like glastonbury this year)
despite the requirement for a driving license or citizencard ID matching the name and address on your ticket this year, people have still tried flogging them on ebay.
its backfired though as they're getting bids of £10,000 etc. and being reported to whoevers organising ticketing so the ticket can be cancelled (without refund) and sold to someone who really wants it; nice work.