Hello, thank you for asking!

I don't mind any amount, as long as I am not paying for the transaction fees... I explained in OP that I am not asking for payment for offering this service, but the transaction fees must be paid by the "clients". So if you wish to buy something and use me as escrow, you will need to send me an amount big enough to cover the transaction fee in the moment when I will send the money to your seller.

Hehe, I am very glad that I helped you and you are also the first one which uses my services twice! Feel free to contact me whenever you wish!

Thank you so much for the kind words!