There are a lot of professional players that don't really want to take their favorite vintage basses on the road, gigging for months at a time. This is where these Custom Shop basses come in handy. And YES, they are very well built instruments. They're not for everyone. As I said before, you'd have to play one to understand why someone would pay that price for one. Normally, "vintage" instruments aren't covered by a lifetime guarantee either, like the CS basses. So there's less dependabillity issues. No matter how old it looks, it's still brand new and in perfect working order.
*The reason I said the SX and the Fender PP would "age differently" was because of the different finishes used on these 2 basses. The Nitro on the PP is already relic'ed and will look like an early '60's bass, right out of the case. Not so with the "new" Poly finish on the SX. Nitro (and other Laquer based paints, for that matter) wears, checks, chips and fades differently than a Poly finish. Nitro is also supposed to let the tone come out of the wood better than the Poly. I've heard many "vintage" (and even some H-1) owners, swear by the finish having a very positive effect on their tone. I'm not sure if there's any proof to this, but I have to admit, some of my best sounding basses have always seemed to be finished in some sort of Laquer based paint. (Acrylic or Nitro-Cellulose Laquers.)
If you like the SX's and the way they sound/play, by all means play 'em.....