As long as you are paying for what you want, not expecting to profit, no harm in my opinion. But I do think that the bottom will fall out of this market. I come to NS via mod revival and am now 52. I see plenty of scooter adverts with price x (or will swap for van that will carry my angling equipment). I don't see that much young blood out there, nor another market (e.g. Holland) that is in the ascendancy for NS. So don't leave in your legacy £10K of NS 45s as they wont be worth much when we've gone.