If the girl is smart to pursue the "strategy" then she must know that she will loose no matter whom she chooses.In fact, I wonder if the producers might have added Rob because they saw that Erin was focused on only two guys and slowly (and boringly) dumping the rest.
There is almost no chance anybody, among all 15 guys, would select her over money. It is absolutely amazing to me that anybody would even think that is a possibility.
An average (or slightly better than average) girl that plays a bunch of men or a million bucks? How can you find any valid choice in this? The outcome is obvious.