Feed him, let him follow me home, and have him introduce me to the Mrs. I'd then breed them and sell the pikers. Charging people for selfies at a Nessie theme park would almost go without saying.
What would you do if were on a crashing plane and the only way to get a parachute would be from a wizard who would, in exchange for the parachute, make you hear every song as though it were being sung played by Blue Oyster Cult for the rest of your life?