Archie, you write:
I know that several times I've been shut out on Ebay on particular Puerto Rico chips that I would have bid much higher on .... had I been at my computer and not in Atlantic City on the weekend when the auction ended. I think this is true with a lot of collectors in general who simply don't have the time to be at the very end of Ebay auction sales (sometimes very late at night or in the wee early morning hours on the east coast).

Why don't you use an automatic bid program?