No one is talking about "naked" shorts. If you own a brokerage firm or have bought a seat on the exchange, then you can do anything you want without paying interest. Then again, if you can do either, why would you be trading a penny stock that is at $.005 cents. Such as stock still requires a lot of money to make insignificant profits. DBMM trades an average of about 2 million shares per day. Even if you are trading 10% of the trading volume, you are only trading $1000 a day. Is that worth it?