Don't be so blind, every MM that plays pennys has an ihub account, bet on it.
we're not talking about MMs....that's a completely different story.....plus, MMs don't keep positions open....their boss won't allow the trainee kids to do that......
we're talking about the regular folks with trading accounts like yours......you can't short a non-marginable with a couple of clicks from your "ameritrade" platform......you have to find a broker, pay fees, minimums and jump thru hoops to short this or any other non-marginable.....