http://www.prosightinspections.com/home-seller-advantage.html
are they NACHI members
Yep.
Some of them are not members
http://www.prosightinspections.com/vincentblack/
http://www.prosightinspections.com/precision/index.php
The few that aren’t will have to go broke looking for buyers in this market I guess. It must suck to be a non-member 
.
There isn’t any in Illinois, so I guess they won’t hurt our business. 
24 franchisees in 16 states. Is that really a major national inspection company? How does that compare to some of the other franchises?
It’s not a franchise.
But even if it was, I can only think of 6 franchises that are larger.
OK then, 24 inspectors affiliated with a company in 16 states. Still sounds like a stretch to consider 24 inspectors in the whole country as a major anything, but heck, whatever floats your boat. 
OK, I understand better now, here’s the explanation from their website:
***No experience is necessary. **We are the affordable, viable option in the home inspection business between purchasing an expensive franchise and going it alone. The typical home inspector franchise fees are $25,000 to $45,000 plus ongoing royalties of 6 – 12% of revenue. The Pro-Sight Affiliate Membership offers the many franchise advantages for less than half the cost. *
About 95% of all inspection firms have only 1 inspector, so they are in the top 5% in terms of size (at least).
USInspect at one time was the largest with about 190 inspectors but they recently pulled out of the residential inspection market and are now a commercial firm.
24 inspectors in 16 states with their own in-house reporting software is a major player (for our industry).