I know this topic has already sort of been beaten to death but I would like to raise a couple more points that haven't been discussed in this thread.
This lot has proven to be able to produce 540 runs (with an average run time of almost exactly 50 seconds) with 2 run groups (80 participants, 7 runs each less a couple drop-outs). On that day we got a late start, changeovers ran long and lunch ran long, but we still finished at about the right time. It stands to reason that with 3 run groups and everything running properly the lot could support as many as 840 (120 people, 7 runs each) runs in a day while finishing at the same time, and, I would add, arguably each competitor would receive the same value. I also think at times the starting schedule was allowed to slip a bit and the time between cars could be tightened up a bit without any impact on safety. Once you factor that in I believe the lot could support 1000 runs in a day if there was demand for such.
On the money front, I would also like to point out that clubs incur expenses year-round but bring in most of their money over only a couple months in the summer. You have to make an appreciable amount of money at each event to cover those costs through the winter. I feel like the SASC is managing their costs and profits well to keep themselves sustainable.
I also agree that the best judge of the "value" of an event to me is seat time and not necessarily the number of runs, although it seems we have adhered to a pretty predictable amount of time on course per run so I suppose for making approximations number of runs works so long as we don't take it to excess.
And, just to take a friendly jab at things:
+ portapotties which aren't cheap
They are in Red Deer