@Xzayer. It's not limited to attractive people either (anyone that's decent lol). Me and my friend are foodies and we've experimented with this before but if you walk into an empty place and sit at the back no one else comes in but if you sit at the front or outside, basically anywhere people can see you, and look like you are enjoying yourself all of a sudden people start pilling in.
This is exactly why the more clued in establishments seat people towards the front of the store first and work back unless the customer asks otherwise.
Some of beef offals are actually quite delicious, if you know where to get it. But yeah, some people would not even touch it, especially if they knew what it is.