It's always cheaper to buy than to mine coin. Mining is expensive. Miners have advantage only in new coins. For example STEEM was only available to miners in first few weeks. But even than you'll find the miners who are willing to sell on Slack or Bitcointalk forum.
@stellabelle you are transferring lots of STEEM to Trex. Is that for mining equipment :)?
No, it's to buy Dash and some others. I'm diversifying.