My criteria would begin with the qualifications of the "teacher." Following that.....I like to keep the words of King Solomon close. After all he'd surveyed including vast wealth and possessions, he looked at it all and called it a...."chasing after the wind."
Today, success seems to be measured in terms of wealth, possessions, notoriety, and career. I'm lucid enough to understand the idea behind having enough to live on, but I refuse to subscribe to anyone who doesn't possess the intelligence of a Solomon.
Seek wisdom first.