Escrowing for yourself...on the one hand if someone is using Quickseller as an escrow, then they are using him because they trust him, or at the very least because they think his reputation is worth more than what they are trading. Him being part of the trade doesn't change that, and it still provides the peace of mind that an escrow can provide.
On the other hand, an escrow is supposed to be an impartial mediator in the event of disputes, which would be very difficult to do when being part of the trade. Even if he knew or thought he wouldn't do anything wrong in the process of the transaction, disputes can still arise when neither party has done anything wrong. That and taking additional fees isn't really the right thing to do. It's probably something one should avoid.
If you and I are doing a direct trade, and I send money directly to you (without escrow), and the goods never arrive to my address, and you are unable to provide any kind of proof that you sent the items, don't you think it would be expected of you to return such money (and learn your lesson to next time keep better documentation)?
I can't speak for anyone else, however if I was selling something to someone and a similar to the above situation were to occur (including others that I may not have been described but would still be my fault), then I would certainly refund the buyer. I can even say that a situation similar to this even occurred that resulted in a partial refund to someone I sold a miner to (you can check my
trusted feedback).
If I am able to act this way in a direct trade, then why would I not be able to act this way when acting as an escrow?
edit: see my previous
post regarding the fee