So it is really weird how I got here, but while studying John 6 (post feeding the 5000 22-26 specifically) I was stuck with this thought from Winston Zeddemore. Asked whether he believed in a large number of supernatural occurrences. He replied, “If there’s a steady paycheck in it, I’ll believe anything you say.”
Jesus realizes that most of these people will keep following Him around as long as the food and the miracles keep popping. But the moment any commitment or work from them is required they are out.