There was/is a guy selling chips from the Crown Casino in Australia that describes them all as rare. I emailed him and asked him what made that chip rare. He replied by beligerantly asking if I had one. I said that I did, and so did many others. I asked him if he would like to get an email from everyone that I know that has one. I didn't hear back from him. <g>
BTW, my definition of rare? Rare, to me, means that finding one is rare, but not impossible or unlikely.