Looks like CCF has a membership of around 45k. Maybe 70-75% North American, so let's say +/- 33k U S collectors using that site, and there's rarely less than 1500 active users at any one minute of the day. I think that ebay would not wish to p**s off any organisation representing that many American collectors, particularly when those guys always ensure that they get their facts straight before complaining.
I'm just happy that they are not as insular as other US groups and will fight to protect collectors interests worldwide.