It seems like deals where people pay money to become an Ambassador are quite routine in US politics: Why is it ethical for Ambassador Sondland to have been given an ambassadorship for campaign contributions?
Is it known how these deals generally work behind the scenes? I.e. can any random millionaire just call up their local DNC/RNC office, come in for some haggling, then walk out with a promise to get a position if Biden/Trump is elected next year? Or does one need to first know the right people and it's not as easy to just pay money and get the job?