I also believe in the “fair” treatment too but I wouldn’t wait as long as you. If they want it really bad and I don’t know them then I need a non refundable PayPal deposit to hold. I offer/expect the same thing if I’m buying.

This needs to happen in hours not days in my opinion; especially if multiple people are interested. If multiple people are interested right away you’re likely under market value so the first responder should want to act fast. You’re not in the customer service game; you’re trying to ethically sell your game and move on.

Once deposit is given then I’m patient with the buyer to make arrangements because I know it’s sold.