300% ROI per year is high but it is a lot less than 1% per day considering compounding. I suspect returns will settledown once more tokens get distributed and some of the heavier gamblers give up. Even with a risk premium for speculating on an unregistered gambling DApp, I still suspect 300% is a bit extreme. Gotta wait more than a month or two of divs before we start speculating on ROI.
RE: Bombarding EPC players with STEEM