Not sure which direction you mean. Delegating your own power is great if you're looking for passive income, and vote-selling is another option. If you're taking short breaks from the site vote-selling will be better, for longer breaks delegation. But if you're active and have good uses for your voting power you're better off keeping it.
It's pretty hard to be profitable as the one leasing power unless you're either running a bidbot/voting circle or you're seeing your profit in community engagement rather than money.