With the few reptiles I've sold here in Canada, I've had more than 50% of buyers back out on a deal a day before, or the day of.
WOW, that's actually GREAT odds!!
I am not joking. Corey said it best when he said "money talks, bulls**t walks". Just wait until you have a 2-month email fest with you sending 30+ pictures and 50+ emails, only to have the dooooode say "sorry, I can't buy the snake". LOL! You will very very soon after that go to your website and make a statement saying that "no animals are considered SOLD until they are either paid for, or a deposit is made on them". Just don't hold ANY animal for ANYONE without some $$$ up front, and you'll be all right.