No.
Yes.
Actually the number is shrinking...at least by one recently. A boardie had an unfortunate incident where a 9.8 was broken in half in the mail.
I'm sure there are raw copies out there that might have some accident happen to them.
Overall the number isn't increasing.
No, but it's silly to pretend that the vast majority of the print run of this book wasn't immediately bagged, boarded & stored safely away upon purchase - just like any other book from the last 15-20 years.
With GPA showing CGC 9.0s hitting $800-900, the top-heaviness (eg. the ratio of high grades versus low grades) of the CGC census numbers for this book aren't due to people not bothering to slab mid-grade copies - which would be the case for pretty much any other modern - it's due to the fact that it's easier to find a WD #1 in 9.4 and above than it is to find one in 8.0 and below.
With a print run of just over 7,000, I don't consider WD 1 just like many other moderns. It's a very low print run for a number 1 and was not a book anyone had on their radar.
Yes, most copies that have been slabbed are 9.0 and above (but that's still under 1,500 copies in the census).
There are 5,500+ copies out there that haven't been slabbed....I doubt the majority were put in bags and are sitting in collections raw. I bet many were bought and thrown out...