That particular seller has a habit of buying up cheap rare or custom basses and reselling them for hundreds more than his purchase price. He's bid against me on a couple basses, pushing up the prices I had to pay, and he's also outbid me a couple times only to immediately relist the item at an inflated price. When I emailed him, his response was to the effect of oh, i never sell basses for profit, I'm just searching for the right one for me!
Personally, I'd stay as far away from him and his auctions as possible.