I keep hearing about how great mentors are, but what&#x27;s in it for the mentor?  Why should someone who knows what they&#x27;re doing provide such a valuable service for someone who can&#x27;t pay them back?<p>In older times, tradespeople literally got a live-in servant for the trouble of teaching them, but other than college tuition I haven&#x27;t heard of a good compensation model for mentors.