Don, I have no scientific evidence, nor have I conducted a Neilson poll......just results. I ran the same chips on Ebay and Jackpot twice and got better results from Jackpot...I love EBAY but Jackpot does a good job too....It is probably smart to use both like I do when I am in the mood to list chips...slot cards and room keys are better on EBAY because of their customer base..hope this helps and that I have answered your questions....