One of the strangest concepts to grapple is the concept on Not Invented Here. Restaurateurs as a group tend to be self-reliant, very self confident and actively seeking new ideas. The paradox is that the comfortable level is much higher when they discovered the idea. If the idea comes from an unsolicited source, the barriers tend to go up. This reaction is no doubt a defense mechanism homed by natural selection to help the species survive. “beware of anyone bearing gifts” .
Though it may be prudent to look at such ideas with some skepticism, exploring the idea further on your own is a much more productive exercise. It is OK to use the unsolicited wisdom of others. It is not OK to dismiss an idea out of hand simply because it was Not Invented Here!