I wouldn't be suprised if he's a senior trader with an MM, he seems real stressed out. I don't think he gives a flying (insert appropriate expletive deleted) about whether or not a stock is a POS or not...only the POS stocks he (or his employer) is caught short in imo.
Read the "tone" of his posts and I think you'll understand what I mean about stressed, I can picture him sitting between a jar full of tums and a bottle of malox.
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