When you say: "Cost to short is irrelevant" --- if you mean the "collateral" needed in order to "short"/"naked short" penny stocks --- then it is very relevant!
"Naked shorting" of penny stocks requires about 250,000.00 of "collateral" being tied up to make (possibly) 300.00 to 500.00 --- and no "sane" person is going to do that!
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