My opinion is that not many here do that, but I could be wrong. As for me ... NO WAY!! That is risky stuff (Shorting) It would terrify me to take that kind of risk on any stock (let alone OTC stocks like OPTI)!!
Shorting a stock is not a nefarious activity, it is a legitimate way to play a stock, just like taking a long position is. With the $2.50 per share margin rules shorting pennies is totally impractical that is IF you can find a broker to allow you to short pennies.