MC...I don't know you whole situation...but you ask a good question...when faced with all they want $$$ wise will they see their way back....
There are several things that could happen...one is that they might realize it isn't "things" that make them truly happy...
or....the OP might feel used for their $$$ and dump them
or....the OP might start expecting more from them that they can't fulfill
or....the OP may just be a user and move on to greener grass
Then what???...well it is up to you...I don't feel that because my H's OW eventually gave up on him that he came back to me...he was on his own for atleast a year following the break-up...had he come right back...I might have questions...
Hang in there....she might figure out what she is giving up...you don't have to compete on the same level...