Really left scratching my head at that one. An ebay sale with a "make an offer" option from an anonymous class seller?
It almost reminds me of make it rich schemes mixed with a secret santa. Spend a day writing a 'chapter', stick it on ebay for $750AU and then go spamming loads of forums seeing if someone will bite. In this case however, I highly doubt that the chapter is usable by another author and I see no recommendations by those in the business stating that what has been produced is art and of value commercially (or non-commercially)
Buyer beware I suggest. Unless you are looking for 15mins of fame the quirky websites will give you if you buy it.