Good pictures, and customer-friendly TOS will go a long way towards realizing the true value of your coins.
Most collectors can look at a good picture and tell about how much it will be worth.
It's not always neccessary for the seller to be knowledgable.
Then, there's always the newbie factor.
Some folks will pay any amount for something they take a fancy to.
Small lots of 3-5 coins, of the same denomination, work well for many dealers, as long as you're sure that no single coin is much more valuable than the others.
"Aren't you suppossed to be out driving a truck or something jody?"
amrad78