A little dated, but mandatory reading that will provide some good context and background info--
The cost of racing - parts 1 -4:
lastturnclub.com
lastturnclub.com
lastturnclub.com
lastturnclub.com
Paying for Racing - parts 1-2:
lastturnclub.com
lastturnclub.com
Operating Revenue and Costs of the ALMS and IMSA - Parts 1-3:
lastturnclub.com
lastturnclub.com
lastturnclub.com