Until I beat it, I won't sell it. I have come close to Valinor three times but just haven't been able to pull it off yet.
Plus, it is my wife's favorite pin. I don't usually go to that pin to start a game because I know that in the chance I have a good game, I will be there for an hour. I don't want to have to stop a good game because I ran out of time. Nowadays I rarely have the time to play a good game of LOTR.
I regret selling most of my pins, some more than others. It is natural I think. For me though, once I decide to sell, it is as good as gone.