No it really depends but I think dumps will not be common on this platform because only complete newbies will think to dump. You can make more money on the internal markets from what I can see but most people are trading on Bittrex because liquidity is flowing to Bittrex.
Overall, I see $10 for Steem sometime in August, which will be good for all of us. The issue here is in order for payouts to increase the winning content producers have to power up. Over time Steem market cap will increase as more content producers power up and by default it looks like some fixed percentage of the money earned goes toward powering up anyway. So just wait.