I think he's being a little hard on her and he should know better than anyone that what you see is not necessarily what you get on these shows. They must have shown him 10 times saying that if Erin wasn't all over him on the last day that he would dump her for the money - and yet at the end he said he would never choose $1 million over her. He also defends Rob at every chance so he's obviously aware that you should trust your own judgement more than what you see on television.
By now we're all quite well aware that many of the comments made in interviews are scripted. Perhaps Wade said what he was told to say. Perhaps he was trying to save face. After all, how would if have looked if he had said, "I soooo would have taken the money over Erin"??