Why would people wait until the last minute before golf season starts and just expect to get a customized club in a week anyway. Yeah, I'll just buy a Kia next time because I have to wait a month for the BMW to be ordered that I want. Why settle for hamburger steak when you can get filet?
Scratch is definitely no filet compared with Mizuno and Callaway and no one is settling by going a different direction. In fact, if you are shopping for blades Protos and 68s are fantastic choices. SB-1s are nice, but do are not an improvement over either model.
A better analogy is why would you walk when you can ride? Also, many people ordered there clubs in January and February - not the last minute before season. You can't get the 8620s - off the rack, retail - never mind custom.