I know when I was a seller I never used to let it bother me too much, but the reason was I had a store with multiple stocks of each item, so it wasn't a matter of having to wait out the dispute process to re-list and sell, I simply continued selling and the case would open and close almost without my being aware of it or affected by it.

As a 'casual' seller I can imagine how annoyng it would be and think perhaps eBay need to shorten the time to pay - maybe 3 days to open NPB and 2 days after that to close.