All depends on your expectations and when your GPUs were bought. 6 1080 Tis still mine over $10 a day, that is plenty profitable to me. However, all of my 1080 Tis were bought last year for below $750 each and 1070s for $334 or less. They paid them over several times already, anything they make at this point is easy free money. To me, mining is worth it.