He was, in an inspired piece of genre awareness, running a school for train lackeys; The thugs and muscle that supervillains seem to have an endless supply of. They don't just grow on trees you know, they need to be trained, and since they aren't the sharpest pencils in the box, they need trained by someone good, and someone who will be feared. So I'm guessing it's partly PR ("Trained by: The Taskmaster" looks better on diplomas than "Trained by: Irving J Welsh" or whatever Tasky's real name might be) and partly to get his recruits respect, since they are a superstitious cowardly lot, as someone once said.
There's a great scene elsewhere in this issue where Ant-Man overhears a meeting to decide on the next intake with comments from the review panel like "No, this one's intelligence is too high, it's nearly average" or "This one looks promising, low IQ and a history of following orders"