The more pricing games that they can have available to play in the quickest period of time, the better off the show will be. Even the most casual viewers will pick up on things if they're playing Most Expensive 3 times a week every week.
Ideally, if they can get Drew comfortable with 30 games the first week, they'll be good. At least 25 minimum (Plinko, Money Game, a couple others could be gotten away with twice.) After that, try to work in a few (5?) new games per week, and by mid-season you can have a game rotation near what exists now. Drew seems like an intelligent guy, so him learning the games shouldn't be an issue.