Some quick replies:
Nothing much, if anything at all. At least until you hit a certain (high) mark. NPBs are not really hurting eBay in the slightest; eBay immediately takes on the FVF, even if you never get paid. Wonder if sometimes sellers forget to open a case and get that $ back.
There is, but I believe you have to have a store to do that. I have also had several instances where a person will BIN and then send me a note saying they will pay in a few days -- and those transactions have worked out perfectly -- so I also don't want to lose that business.
I just had a NPB last week; closed the case, credited my FVF, and hit relist. Took out another $0.30 to list it.
If there is away around that, please let me know so I can use it on this most recent item.