I'm glad someone out bid you. It's always upsetting to make a mistake if it costs you money, but you really have to read the listings details-Some sellers are REALLY shady! They will use "stock images" for used items,profit off shipping,hell, some people just BAIT and SWITCH an item.
A few bad sellers(and buyers) make it harder to do "business" on Ebay(that's why I have my own website that's hassle free)
As an EBAY Power Seller myself, I can honestly say that i do not offer "auction style" listings anymore because of the numerous bid retractions, non-paying winners, offers to "end an auction" early emails.
I now only sell my EMS Kits as "Buy It Now" style listings that require instant payment. I list very detailed descriptions, as well as shipping/customer service policies.
Sorry for going off on a rant, but I too learned the hard way about "skimming" over an auctions details.