I've seen complaint after complaint about people getting insultingly low offers on the animals they have for sale. Here's a tip: if you have verbiage in your ad that indicates you are forced to sell, you will be a target for low-ballers.
Examples:
"Need to make room in the rack..." - Either get another rack, or drop the price slightly to move the "overstock", and re-evaluate your breeding plans if what you're producing isn't moving.
"Wife/Husband/Mom/Dad doesn't like..." - This should have been discussed before you brought the animal(s) home. Yes, I've seen that ad. Heck, that's how I ended up with two free BCI's.
"Girlfriend/Boyfriend doesn't like..." - Really??? You're going to get hit hard on this one since you have two people working against you, or you turn the BF/GF into an ex. Choose wisely.
"Moving, must sell..." - lowballers will know that the longer they wait, the more your price will have to drop because you have a deadline to meet.
"Car died...", "Rent due...", "Overdue bills to cover...", "Life/Health issues..." - lowballers know that you need cash immediately. The fast money is the low money, just ask any pawnbroker.