some of my worst ebay experiences were:
– a fake drown promo (got a refund in the end, but still lost a lot of money and energy on it; i think i still got some scans i could upload to spfreaks.com)
– a broken live in chicago 23.10.95 promo cd (remember, arthur? – i never got a refund; the seller declared that it was not his fault that a cd merely packed in a simple envelope did not survive the trip; luckily i only paid about 20 euros for it)
– a live earth promo, clearly fake; worst quality ever (what a waste of empty cd-rs, stamps and energy; still haven’t received the refund i was promised… hmmm…)
there’s more, but this is what i thought of first.