to me, the CF wheels are pretty much relegated to be a future Barrett-Jackson cherry on the sundae when the 10-mile 170 that has been in a bubble for X years goes across the auction block. They are not going to hold up with regular racing use, changing tires often, etc. The other way I look at it is, the psychological aspect of when I only have 1 of something precious to me, I will hang-on to it and preserve it, etc., but if I have (2) of that precious item, that frees up the mind to go ahead and enjoy without stress one of them as intended knowing you have another "on the shelf".
So if I were a 170 owner with my money, I would pretend they didn't exist and go have fun with aluminum wheels. If I had Jay Leno kind of money, I would buy another set or two of the CF wheels and lock em away, and use a set on the car.