How do you know that? Done that yourself before, or friends, or just hearsay? Sure would like to see a screen-shot proving your theory! Until then it's just a theory and nothing else.
BTW, all of your recent posts here are theories and nothing else, or did I miss something you can prove?
Not at all it is a very common practice with penny stocks.
Edit: Why only penny stocks, if true, why not on big boards? Another thought: If true, then big banks like JPMorgan would be doing that too. Are you accusing Jamie Dimon of fraud? Ops...