Well, that really depends. Based on what I know from historical data, it was significantly more profitable than it is now, in the past. However, all of that is assuming you are talking about mining and immediately selling. People who mined, held for a bit, and sold, could have made some MASSIVE profits.

I don't sell anything, I mine and hold. And hold. And hold. I'm waiting for a massive gain or nothing at all. It's pointless to me to mine and sell immediately for like what, $20/day profit and dropping every couple weeks?