You will earn about 1.5$ per day , that means you will ROI in 6.6 months. Depends what you consider profitable. But anyway, even looking at their site, design is shit, basic info, no pictures and other stuff that will prove that they are actually mining so it is most likely
SCAM and I would recommend everyone to stay away from it.
I think, your concern is pointless. They are pretty consistent in payment from Day 1. Here is their payment history for verification -