Tom, unfortunately, that's a bit apples to oranges. FC cars are built from the inception as racing cars. Our cars are built with NO thought from the manufacturer about racing, they are designed and created to sell in a competitive new car marketplace, and the technologies they embody are constantly evolving. I suggest that, if time stood still, and cars that entered the ITCS were frozen technology-wise, that our rules would be more stable.
I also think that while you suggest that most enter IT because it is cheap, that in fact, most enter IT for a more complex set of reasons. I bet that many decide that the Formula and Sports racing categories need to be eliminated for family reasons (logical or not, wives who perceive certain disaster can put a real damper on the racing hobby), and our category attracts those people who wish to race sedans/coupe style cars utilizing the original chassis, because they are turned off by the amount of work and engineering expertise that is required of Prod and GT racers.
You say "Cheap", which to most means "less cash", but IT is popular, in my mind, because it is lower cost. And lower cost is, to me, less engineering: no billet cranks to design and produce. Less material science:: no carbon fenders and hoods to mold and produce. Less finite element analysis: No space frames to design, loft and weld. And so on. "Lower cost" encompasses much more than pure cash.
And, in actuality, if winning trophies on the cheap were the reason for most who race IT, their dollars would be better spend buying old Prod cars, like a friend of mine did, then going out and grabbing trophies at the Regionals. He spends FAR less than even me, and scores WAY more trophies. But he races against far fewer.
What I'm saying is that IT attracts people for a far more complex set of variables that cash alone, and I think the ruleset and the leadership have a lot to do with it.
Regarding the ITAC, resumes are submitted by members wishing to serve, and as openings occur, they are filled from the pool of candidates. The goal is to have an ITAC with individuals that are diverse in the category (members representing most, or all of the classes) are from diverse geographical areas, and who have resumes displaying aptitudes appropriate for the job.