The Blue Hot and the ThunderFlash were kind of specialized and, now, very hard to get balls. I don't think the Eraser was that specialized or hard to get. Plus, there are a lot of potential equivalents currently out there. The problem with an Ebay sale is, once the reserve is met, IF you do specify one (that used to cost extra), you have to sell it to the highest bidder.
Right now it's not old enough to be of serious interest to those who have had one. It might take a few more years to increase in value. (Wasn't it one of the first Accu-Tread balls??)
It was a good ball; you might want to keep it for yourself. Like the new/old Track Heat, sometimes interest in a particular ball will rise out of nowhere.
Good luck.