You sort of do when you get the SF 97. There was another sheet with mine showing a company paying sales tax on so much, which I think was about 1250 on the purchase price, then it was sold to me for something over 3000 and I paid a buyers premium and sales tax on it. So for an example, wholesale cost 1250, markup or auction price, say 3000, plus a 10 percent premium, 300. There is a 2050 return on your 1250 investment. From an accounting point of view, someone is getting a M923 for less than scrap value, getting the difference plus 10 percent above that. Seems like a pretty good rate of return to me. Of course they have overhead, site rental, and employee costs, plus whatever equipment costs they incur moving stuff around and loading.
This might lend credence to the theory floating in another thread about vehicles being randomly pulled after the auction has closed with the idea that they may not have made what they thought they were worth. Ah conspiracy theories.