This should have been your first hint that they were bootlegs.

"Cover graphics may vary due to supplier!"

As for why he is doing it. I don't think it's money/profit issue with him. So I have no idea why. No matter when they come out. They will probably set a sales record that may never be beat by any other release on DVD.
Hell, I've bought every "new" version they made on VHS. And I'm sure I'm not the only that has done that. I must own about 6 copies, in different versions. And I'd buy the DVD version as well. But I's also like to have both the "normal" WS version and the SE WS versions on one disk, even if it means making it a flipper. But the main reason I want a DVD of them, is for the sound improvments over the VHS tapes, more so than the picture. Otherwise I'd just burn a copy of the VHS to a DVD with my burner.