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Marc S.This doesn't address all of the situations, but here are some things I do know.
1) Ebay has a Free Listing Day every few months. The last time Ebay had a Free Listing Day (end of December), Mike Wheat listed nearly 2,000 cards.
2) Ebay typically allows items to be relisted for free (provided that they actually do sell at some point). So, sellers can potentially list things quite a few times before they actually sell. I'm not sure how many free re-listing are allowed. Ebay promotes this, though, because their stock price is a function, to some degree, on the number of items listed on their site in a given time period. Thus, when items get re-listed, it looks better for them.
Marc