Hmmm... The mathematician in me notes that if an item costs, say, $100 originally, and you take 100% off its original price, then its new price will be $0 since 100% of $100 is, well, $100. So I'm not sure how you can sell anything for 5000% off... My calculator indicates that this coin had a 99.9998% discount from its original price. Just saying...
It was a joke, in line with the absurd original erroneous price (not a funny joke, apparently) Edited-- oh-- you were being funny too?