I don't think that the members being suspicious about your post are in the wrong here. If you think about it 100,000 BTC is a lot and you considering an escrow here in the forum is something strange, I don't even think a single escrow service here in the forum have handled that kind of amount even if you combined all their transactions together so it would really be a strange request for them to handle such thing, I even doubt that they'll be confident in taking that amount without even being suspicious themselves. Since we are talking about a big amount here why don't you just take this transaction to a more professional service where they can confidently handle that kind of amount.