Hmmmmm....I think I'd be a bit suspicious as well, especially given the only form of contact is via email and he wants your fleabay username as well. Can't work out quite why this seems sinister but whats wrong with the seller simply giving a contact pnone number if he's so keen to sell it??
Not sure it's because i look at k1200's or it attracts that type,but have seen several scammers,had a guy in Holland giving me all sorts of bollocks about one sixmonths ago,very convincing even about were he bought it from in the Uk in the first place,normally find there only on a short time then disappear.