Quoted from ypurchn:20000+ TAF were made. It somehow commands $5k+. That tells me that a lot of these aren’t moving around...
It took me about 4 years to finally nab one for a decent price and condition.
People tend to hang onto them for a good while. It's a good game. But, it might get a little stale in a smaller collection after you've basically mastered the game, since it isn't a terribly deep game, as others have mentioned.
It's fun and entertaining, and if you do get tired of it at some point, it probably won't take very long to resell it.