So I sold an item a couple of days ago, BNWT, original price clearly visible in the photos.
Winning bidder has overbid imo, but sometimes they do if they really want something. Total bid + postage is 50p over the original new price.
I did have a gander at their feedback - not great, total FB < 50, at least 4 or 5 negs and a couple of neutrals. 
So today I get a message saying, "Hi, will pay on 11th Feb, cheers, crapbuyer28"
I really dont' want to sell to this bidder at all, cos I reckon even if they do pay, they'll kick off about the item in some way, and the whole thing will be a giant PITA. Otoh, I have 100% fb over 500+ transactions, and really want to keep it that way.
So what is the best way of proceeding:
- send a reply to the message saying, "Auction clearly requests payment within 24 hours, if I don't receive payment within a reasonable timeframe I will file a nonpaying bidder strike"
- Say nothing, and then file a strike after 4 days, or whatever the time limit currently is
- WAit till 11th and see what happens
My aim here is to avoid getting neg feedback, and ideally blocking this bidder asap.
WWYD, experienced ebayers?