To Price on Ebay can be a science in itself. I have tried a few different ideals and have been moderate at best in my results. My basic way now is I will post it the first time as close to the value as possible, then take a couple bucks off. For example, get lucky find a item for 3 dollars, I think is worth 10, will look around to verify the value. O.k. now it would seem they are worth 12 bucks, cool. Now the first post will be 10 bucks,(9.99) save a little on the fee. If it don't sell then the second time I will repost for 50% off. $5.00. If it sells then I still make a buck after fees, but If it does sell the first time I make a bit of profit. Now step back and see the whole picture. It is not so much the profit of a piece, but the profit of many pieces, you must try and win more then you lose, and when you lose make it so you have a least made a buck. There is so much in selling on Ebay, but most important is Timing.
They true value of any item is what 2 people are willing to pay, you need to find the price that will bring in 2 not just one bid.