Does escrow really work with secrets like this? The buyer receives the exploit and claims it doesn’t work. The seller claims it does. The money is still in escrow. How do you proceed? The escrow agent is getting a commission, they should not have access to the full secret. It’s really hard to find an escrow agent who has the skills to assess an exploit and whom both the buyer and the seller would trust not to leak it or use it for their own benefit.
Depends on who the buyer is and yes, it does work, there are even specialized marketplaces. You'd still be dealing with the devil but you very likely will get paid.