I think the biggest problem that has come to light here is that you have absolutely zero patience. If you require 24 hour payment, which is already not the eBay standard but whatever, not the point, then give the buyer 24 HOURS to pay for the damn thing without having to respond to 15 messages.
That being said, yes NPB's suck but that's part of eBay. No use complaining about it here unless you are giving out names for others to block.
Epic 20 caser: 117, 129, 198
Houdini 10 case jumbo: Topp 100 case 10, 184
Nordy 10 case hobby: 72, 76, 126, 202, 261,