Similar To Surveillance
This movie seemed to have similar plot elements to Surveillance with Bill Pullman. Both movies involve a twisted couple and the crazy things they do.
Cheap Thrills is about the long form con and how sinister minds draw people in, how twisted the game of control is in humanity.
And maybe some similar plot elements as Indecent Proposal too.
This is a unique film, but film has dealt with this topic before, temptation and how low will you go (for a dollar).