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1) He's rich, or;
2) He's filthy rich! :-)
I checked out the feedback of one of the guys you mentioned, they look legit...perhaps he bought a lot of those sets when they were still at their "reasonable" prices. Or even at a sale or clearance, perhaps. No conspiracy needed.
But could they have bought hundreds of sets of each box?
Every week a new Joker, Bib Fortuna and General Grievous is being offered by these guys.
Sometimes, people get special deals from LEGO-- often times when this happens, you're expressly forbidden from re-selling the LEGO, but sometimes not. I've had the opportunity to get hundreds of Shadow Knights, hundreds of Exo-Force characters, and a few others.
Some people got good clearance on particular sets, but rather than sell the PIECES (which don't sell all that well), they sell the minifigs, which are sometimes worth the cost of the entire set if the clearance price was good enough.
Some people STEAL the minifigures from stores (this is sadly more common than it should be) by purchasing the sets, taking out the figures, and the RETURNING the sets to the store. This happens now and again with AFOLs reporting purchasing sets with no figures in them (more often with Star Wars).
Hard to say without asking the seller, but there are a lot of possibilities out there, some totally valid, some underhanded.