I get them, but WAY less than I ever did on eBay. NOW I can permanently ban the collector, and not just the ID, which does no good, because they simply get another one on eBay.
For three years I have kept my non-pays to under 1%, both by price and by volume. Judging by the huge amounts of re-lists I see on most auction sites, I would guess they have a growing non-paying bidder problem.
Bruce