Well, i don't think it is because they are making tones of cash, my opinion and experience, the affiliate channel perhaps was not producing the multiple they require and the hassle was not worth it.
It has happened with one of my previous companies and e had to do same - it was a financial company. we worked out that affiliates were not targeting the right demographics and that only 6% of affiliates were actually profitable.
so, note of warning to all affiliate managers, manage your accounts well
or lights out