Okay how many of you like this. Okay you get contacted by someone that wants to buy your stuff then you mark it as sold and 3 days later you cannot get in touch with them. I have been pm-ing and emailing a guy who wants something from me. How long do you wait before you re-list it? I mean I know alot of people have day or night jobs that it could take several hours to get back in touch with me but several days is too much. when I buy something i'm like a kid at christmas i can't wait. ... ....

Final email, tell him he has 24 hours or you'll relist it. after that, he loses.

report him if you have to

As running gag said final email saying if you dont respond in 24 hours you'll relist the items that are for sale. If he doesnt respond within the 24 hours then relist the items and forget about the guy. Also as OverDosed said You could consider reporting the guy. But that last part is fully up to you and weather you think he is intentionally messing with you.