People are much more willing to share information in private with their friends about which investors/vendors/employees/etc. are good/bad. "Hey, I want to talk

People are much more willing to share information in private with their friends about which investors/vendors/employees/etc. are good/bad. "Hey, I want to talk with someone at Firm X, who is good?" "They are asshats, call me, this is why..." leads to impaired dealflow for Firm X.