Your premise is flawed on so many levels, but realize that to give Freddie Mac suggestions required hours and hours of studying the situation. That’s why Newt gave the advice he gave, and it didn’t meet with what the scammers at Freddie wanted to hear so they ignored his advice. You are trying to make this sound like a check was written and no real work was done.
Maybe you want to keep up with the story. Newt said he was hired "for his advice as a historian". This, of course, makes no sense. Then Newt, at the debate, claimed that he told Freddy "This is a bubble, this is insane, this is impossible". Freddy came back and said this is not what Gingrich was hired for and that Gingrich never warned them about a "bubble". Now today, when Gingrich was asked if he warned Freddy about a "bubble" he stated that he couldn't remember.
I know a check, a very large check, was written and cashed by Newt. It's also obvious it was to protect Freddy's interests. It wasn't for a history lesson. I don't claim Newt engaged in any illegal lobbying, only that he was used by Freddy because of his political connections, not because of his knowledge of history.