I do not believe your statement to accurately reflect the reality of the shorting going on in ONVO.
There may have been shorts on at 2,3,4, etc, but 2014 saw mega-shorting.
And it has spoiled ONVO for everyone. It's not going down or up. And it could very easily do this another year as well.
This is the beguiling trap of sideways action, it can go on forever. This is water you need to swim out of.
I think margin requirements for long term shorting should be quadrupled, now. Or perhaps, double the required margin after each Friday to Monday period you've held a short on your book.