fleabay tax
The money you spend fixing all the dents and half arsed repairs that the original owner inflicted on your newly acquired 2nd hand amp/guitar/unicycle. Allow typically 10% of RRP.
'Picked up a manpad for 800 bucks last week. 'Cost me another $700 in fleabay tax tho, some nonce had stuck the sights back on with chewing gum and gaffa tape. Gah.