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I pretty much agree with you Journeyman, that you shouldn't stretch or chase just to have plays for the games that are on TV. By the same token though, I don't think you should cut back if you see eight games on the card that truly provide value according to whatever criteria you use.
It's a little easier for me, because I use mathematical criteria that don't leave me much wiggle room, so if I have no plays on a 15-game card so be it, and if I have 6 out of 6 games on a Monday that's OK too.