Imagine a show where Rob was offered $1M if he got one of the women to choose him, but had to give the show $1M (from his bank account) if the woman didn't choose him. Would he (in his right mind) agree to go on the show?
This is exactly the scenario that Erin has apparently agreed to.
And, if she wins, she presumably splits the $2M with whomever she picks, and stands a good chance (if the relationship doesn't last) of winding up with $1M.
Sorry, her decision makes no sense. The show must be rigged or distorting the information.