NL players hold greater edge over lesser opponents than Limit players

[AKQJ10]

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The reason why it hasn´t dried up is imo quite obvious:
It is for the exact reason why you don´t play limit HE against idiots and why the idiots like to play it. They realize thet their chance to win is bigger so they stick with limit and kepp trying to draw out on others.

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Playing LHE against idiots is insanely profitable. It is, however, high-variance. (On second reading, i'm not sure if the "you" here refers explicitly to the OP. If so, you're right: that's the reason he chooses not to play in that game.)

Of course your mention of controlling the odds is substantially correct (I didn't bother reading the numbers) and a NLHE player has a bigger advantage than a LHE player over equally bad players who chase any draw. But there's no guarantee the fish will continue to voluntarily give up so much edge by playing NLHE forever, and as long as there are fish in the high-variance limit games, those games will still be wildly profitable.

If you would turn down a high-EV high-variance game to play a marginal-EV lower-variance game (e.g., if NLHE didn't have so many fish), then you probably need to work up more bankroll.