Im actually surprised there are still people mining dbix. But maybe they have very cheap electricity? For me its cheaper to buy the coin than it is to mine the coin with the electric costs involved.
There is this possibility that people with 1-2GB GPUs are now mining dbix, due to low DAG numbers. I have not calculated this yet, but i suspect, using cheap used lower end cards, they can RoI quite fast.
When eth reaches epoch #170, all those 3GB cards will also soon mine dbix or ubiq.