Some key points that I think were overlooked here...
1) As far as I can tell, SB's are the most volitile category from week to week. This is just based on observations, mind you, I don't have the data to back it up. The logic stems from the fact that SB's rely as much on the catcher in the battery as on the guy stealing the bases. This perception devalues guys whose value is almost entirely based on steals (Crawford, Pierre, Reyes, Figgins, etc.). I'd much rather hedge my bets with four or five guys who will steal 10-20.
BTW, Rotoworld does a great job of looking at catcher matchups for steals guys every week. I find that platooning bag-swipers at my third OF position is a great strategy.
2) If you draft with blatent disregard to consistency, on average, it will work itself out. Basically, the odds of your whole team going cold or going hot in one particular week are slim. More likely you'll have a few guys up and a few guys down, and everything will balance itself out.
Those things being said, I still agree that consistency can give a guy's value a slight boost in H2H. However, I don't see it as a huge factor, and as others have said in this thread, it might just give one guy an edge if he was a push with someone else.