how much the opportunity will cost. A large premium might dampen my desire but a reasonable premium to get a piece I had the hots for.. that's no longer made? Why not?
I like the 3712 as well but I question the "collectible" status and its perceived value down the road. I think you are very much aware of the 3712 along with the other Nautilus models and the market, but more importantly, how fickle the market can behave.
I recently purchased a Patek which is about 22 years old and paid about three to four times its original list price. It's not a piece that folks talk about on the forums, it's reasonably small, non-complicated, very few exist, I don't know if it made sense or not, I don't know if it is going to be worth even what I paid down the road, I didn't think twice, the price was high but an opportunity for this just doesn't show itself often, I wanted it and ... I got it.
Everyone has their own reasons for spending money on "necessary" things like this and it doesn't have to make sense to anyone else.... but you.
Good luck