Well, in general I can only advise to walk away from any deal which sounds fishy - there is no amount of money which can compensate for that. That's because a con-man will *know* what the con is about, so anything he'll offer as guarantee will always be worth less than what he expects to gain. Trying to outwit a con man is a fool's game.
Otherwise it wouldn't be irrational to accept bitcoins per se, but it's difficult to see how that would ever make sense - it's not impossible, merely not compelling. You could also offer to pay in silkworm futures - if you just happen to have a large amount of those - you will similarly have problems finding someone to accept the deal, and for similarly reasons: your potential business partners will not have any idea how much silkworm futures are worth, how to convert them into money, how to transfer and handle them. Just looking into that is effort, and most people will be unwilling to invest that effort.
That's why money is such a great trading tool, and has almost completely replaced bartering with goods.