For comparison...
Standard 10k WoO 24 car purse, $47,800, $2500 5th, $2000 10th, 800 start
Standard 5k All Star 24 car purse, $25,175, $1250 5th, $1000 10th, 500 start
Standard USAC 24 car purse (for side by side purse) $22,450, 900 5th, 725 10th, 500 start
I feel the problem USAC is having is 410 sprints are becoming more and more localized to Indiana. In 2018, 104 of 246 races (%42) were in Indiana, and 2019 is 96/195 (49%). So when a lot of places USAC goes to outside of Indiana, there not much of field fillers there.
Bill
SprintCarRatings.com