Hm. So the seller risk 1x and buyer 2x while the seller has the goods. Though the seller only sends the goods after the escrow address was funded. Additionally, who has to send first to the escrow address?
When the buyer has to send first 2x then the seller is in favor risking nothing. If the seller sends 1x first then he would be in risk of losing 1x. So a scam can happen by both sides. And using a new account will ensure that a scam accusation thread is useless.
Even when both sent. Then the seller risked only 1x and the buyer 2x. At this point the buyer is more at risk. The seller can extort for more than his 1x.
The buyer and the seller send funds to the MultiSig address at the same time and in the
same transaction.
In most cases the seller is more reputable than the buyer and his reputation worth more than a single purchase... but it is doesn't matter, because the scheme is assumes that you will never put a desert eagle near your balls and will never shoot yourself in the foot.
Well, when I feel into the situation then this surely is nothing you can use for every trade...
There is nothing complicated for you as the MultiSig escrow agent, just to prepare the transaction, help verify and sign it, broadcast it to the network. All responsibility for any decisions lies on the buyer and the seller.