My favorite game is WPT. I'd let it go for $3500 or more because I know I could get another one for less.
What I won't sell (and "almost-favorites") are CV, LOTR LE, and LWJP. Beyond "HUO," I'm the original/only owner of these and that can't be replaced. (LWJP is also a "trophy" game that I won, so I can't sell it.)