Because I don't wan't to find something I really want from, let's say the German eBay, just to realise that it was somewhere written something, that for someone that doesn't know German well will be mistranslated. Since I don't know German well, I will thus never ever be sure as of what I am buying unless the seller can reply to a question in english.
Well, if you don't know what you are bidding on, then don't bid. It's that simple.
