Trump insiders mock Kimberly Guilfoyle behind her back after 'low price' revealed: author

Kimberly Guilfoyle's alleged cash-for-favors arrangement has Trump world snickering, but not for the reason people would expect, according to a Trump biographer. Michael Wolff told co-host Joanna Coles on Thursday's episode of "Inside Trump's Head" that insiders are mocking the U.S. ambassador to Greece over how little she allegedly charged. The Wall…