I used to track Triumph, Norton and BSA big twins every year, it got tedious.
Ever since the second big auction moved in to Vegas, it's never been the same. There are too many big auctions these days, unless you have a very rare bike, you just don't get that top dollar the way it used to be in Vegas.
People used to buy cheap in Deland, FL, then hold the bikes for 11-1/2 months and sell them for huge profits in Vegas the following year. You can't do that any more.