I think it's not about selling pressure, it's just people don't have an interest in BitShares atm. I can't be used to do much. Others can be mined or already have funding or companies interest, etc. What we're lacking atm is utility, something that feels a need. Until we have Bond Markets, Prediction Markets or companies using BitShares as a platform (ie exchanges), we won't see any price rise. Maybe we're lucky if there's another btc run but that's it, the same way we might go up, we'll go down, there's really nothing to keep us with a better price.
We might have the best chain and technology but it's pretty much half baked. It's not accessible or user friendly so it just isn't used. It will require more time for that.