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Can we trade steemit coins?

Yes
https://bittrex.com/Market/Index?MarketName=BTC-steem

How do we profit from this?

  1. Buy Low, Sell High.
  2. Make good post, get upvotes, earn STEEM, sell STEEM.

Yes, you can trade STEEM on OpenLedger or Bittrex. If you want to profit from it, you will have to write good post :-)

I would encourage you to participate using Steem Power, which is Steem that's been committed to the system - it gives you the power to reward others and yourself for being an accurate voter.