IMO, I think that since you set the price for the animal, you then have the right to charge the buyer your out-of-pocket expenses (within reason of course, there was a post on this site a while ago, and the seller had an animal listed, stating the price for the animal, and quantified it by mentioning that the price was was it was due to the cost of food that the snake had eaten over X amount of time). Sorry, a rant of sorts.. Yes, you should get $500 when you charge $500 for said animal. If the buyer is willing to pay the cost of the animal, and then bitches about a $12 handling fee, then he can certainly find that animal elsewhere. You're not Wal-Mart (no offense) you're not taking in millions of dollars a year selling your wares, we're all grassroots, and at this level, these are costs that should not be 'bitten" by the seller.
GREAT post Mykee. I agree, for sure. But its going to be hard to convince the buying public, ha ha!