Roy Cooke article in Card Player is wrong.

[DeathDonkey]

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increasing the ev per hand played and thus reducing their fluctuations and required bankroll.

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You might increase the average EV per hand played by cutting out some of the marginally profitable ones, but the tradeoff you make is decreasing your total EV. Put another way, if playing QJs under the gun is marginally profitable, then by folding it you are lowering your total expected $$ won and probably lowering your variance. But if you reduce your total EV by too much, then your variance will increase anyway, because you will be a more marginal winner - Nate the Great had some very good posts on this subject if I remember correctly.

-DeathDonkey