Brian Fantana,
If you're joining, I think you'll find that any offer to fly overtime will not go down too well with your new colleagues. Virgin is a 750 hours airline.
Anyway, to answer your question, the rate is not (and should not be) good enough to be worth exceeding 750 hours. If the company need you to do more than that, they can hire extra pilots. That will bring down your time to command. See, everyone's a winner!