I may have used the wrong terminology, my apologies. The way I understand it is you can either sell your mineral rights or the lease bonus. They (the auction company) provide a lease that is more favorable to the mineral owner than the standard oil company lease and then the bidders bid on your bonus per NMA. You can take the auction price or not. If you do, the buyer pays their commission. If you don’t take the auction price you are only obligated to list your minerals/lease with them for 12 months so they can try to get your desired price.
I have a call into them for a copy of the lease, but they said they had 8 or 9 additional paragraphs (depth clause, overpayment clause, etc.) that are not included in a standard lease.