Dave,
No flaming required! Just some corrections and additions to your flawed premise.
The 280 car count you list is on the extreme bottom end. The average is probably closer to 350 with events like the Vegas national posting 433 entries in just 4 categories.
What you also fail to realize is that for each sportsman entry, there is on average 2 crew passes purchased at a cost of $75 each.
Total payouts for each category are $11,000 (Comp), $13,300 (Stock) and $14,300 (Supers and S/S). And those totals are only achieved if every single paying position is filled, meaning there were no buy-runs in the money rounds.
So at the Vegas race, NHRA took in $173,200 in entry fees and crew passes. They paid out a maximum of $52,600 in purses.
Do you think $120,600 would go a long way to covering a weekends worth of operating expenses?
Even at an average event, where the payouts are even less, there going to clear almost $90,000.