You pretty much hit the painful AX thing on the head Mark.
It is good for newbies to learn car control. Once you have some basic car control, AX is a complete waste of a weekend day IMHO. Soooooo boooooooring. It is cheaper to buy a ticket to an amusement park as you still get the joy of waiting in line for an hour to get a 38 second really fast ride on roller coasters (that are likely faster overall frankly) and you don't have all the pain of maintaining and burning $$ on fixing a car, tires, gas, etc.
Many of the AX guys, when I really press 'em, come back to an idea that at 60 mph if they loose it they feel they have more chance of catching it and coming out better than at 120 mph on a long sweeper... so I think it is that fear and lack of ability that keeps AX going. Fine by me, and I would prefer fearful and slower people not be on the track when I am on it, so AX certainly has its place, but I agree, not my cup-o-tea.
'Course, if I had it my way everyone would have to run a lap like Top Gear does with celebs, in a simple, provided car, but have to beat a specific and reasonably fast time just to get their driver's license. Half of the Top Gear celeb board should have their licenses revoked until they learn car control and how to actually drive = different topic

That is what AX would be good for