As part of eBay's 2012 Fall Seller Update, the company have elected to ban several "metaphysical" categories on the grounds of protecting customers from being lied to by sellers. This means that listings for "spells, curses, hexing, conjuring, magic, prayers, blessing services, magic potions, [and] healing sessions" will be officially discontinued as of August 30th.
Since these products don't promise any sort of tangible value in terms of physical change unless you 'direct the energies to yourself' (example: vampire transformation spells), the idea of something like this in terms of online commerce is essentially flawed. It's an unfortunate case for the wizards and witches out there, although we do recommend craigslist as the closest thing you'll get to the Diagon Alley version of online shopping.
There has been a petition to bring these metaphysical categories back, which has gained over a thousand signatures so far.