A few points:
These sellers are in violation of ebay's policy. Fakes and forgeries are not allowed. They will claim that they are within the rules by "selling asa reprint", but unless the card has reprint on it, it's flat out a fake, meant to deceive the public. They can only be stopped by reporting them to ebay for copyright voilations.
ACEO/Art Cards - whatever about how they look, etc. As quoted from ACEO.org, they were supposed to be treated as casually as a business card - i.e., given away. When you find several of these on ebay (and several were listed here at one point, I don't know if they still are) that are SN15 or less, these are no longer being made to be given out and traded. When they use someone's likeness or team logos without permission, they also are creating cards that are not legal.
TCDB cards - we joke about them being worth thousands and stuff, but they have been (at least to my knowledge), simply in the spirit of the ACEO cards. I hope none have gone up on ebay.
So please, if you see a fake being called a reprint, please report it. you may not be able to stop all of them, but every one you do stop is one less.
-- Dan --
Note: Please see my profile for more info regarding trading (section updated 3/4/2024). I have added a large portion of my inventory to the site, and currently have trading turned on (details are in my profile).