...
And for the
meat-challanged: If you slaughter a cow, the
meat gains in worth over time, since
beef gains worth if it is
well hung. Some even say it is best if it is
hung over a
longer period. Like with bitcoins

Eww? The best way to make beef tender? Beat your meat.

Actually, part of the grading process is how long it was aged. Fresh slaughtered beef is much less tender and more bland tasting than aged beef. The longer it's aged, the higher the grade. I actually liked your analogy, though, just because I have worked with cattle (the bovine sort as opposed to the the two legged sort) and quickly came to realize that most of a cow's value is after it's dead

That being said,
it's unlikely that these devices will stop working that quickly. If they make breakeven, then the diff would have to continue to skyrocket for well over a year even by that ridiculous 66 percent per month increase before the electrical cost outstripped the income to a detrimental degree. And that also assumes that bitcoiin remains stable or declines in value. Over the term we have been able to observe, neither condition seems likely.
No one is arguing that mining is a bad investment if miners break even. It's the likelihood that miners *won't* break even that bugs us. Sixty-six percent a month is *nothing* compared to the difficulty growth now -- the difficulty growth is ONE HUNDRED AND TEN percent (110%) for the last month, 208% for 60 days and 441% for 90 days. Sixty-six percent would be *nice*.
Of course, i can't convince you with numbers, charts or logic. As the saying goes, rational arguments never convinced anyone.