We all ahve to agree we like to check for a fairly cheap price when we buy something. We are living in a society of advertisement of discounts, and no taxes or no payments till... so yes we will tend to bargain for everything we buy.
The other point I see, is the reputation of the seller. If, the seller has a good reputation, I would rather pay a little more to get something from him I can trust it to be because of his reputation compared to someone who doesn't have that reputation.
And if you are looking to make money with lizards, well let's say leopard geckos aren't in the top ends. Also, if you want to sell at a price you are asking, why not put some pics of your stock, this way people will pay the price if they think it is worth it.