How long do you wait???

Sent pics of 11" backing plates to a member, on Wednesday, who asked to see them - he's thinking about buying them, along with new front sway bar endlinks.... I emailed them to him as requested, and sent a couple of pm's thru the site that I sent the email.... I've seen several posts from him on various subjects/threads since then, but he has not responded to my email or my pm's.... I've got 2 other members in line for the end links - how long do I wait on the 1st member before moving to number 2............ Not gonna call him out by name, as no parts/money have been lost.... I just don't want to keep the other guys waiting with no answer..............
That's really common on here,most of the time they are trying to get a better price from someone else while keeping you on the hook.If they were interested they would make every effort to reply to you.These are the ones that will act like you shot their dog after you have sold to an interested buyer.Sell to the interested buyers,let the game players go.