I think I probably wouldn't take the chance. Yes, everyone IS new at some point but it doesn't mean I should have to help them get FB. They should start small by buying small things. Since it is your first big item, you have to decide if it is worth the risk. But IMO, the risk is mostly things like they have unrealistic expectations and that they give negative feedback for unreasonable reasons or without communicating with you first.
ITA!!!!!!!!!!!!! On all counts!!