As for AMhash. Buying it is similarly cost effective as buying Prismas - details varying on specific individual cases. It could give positive ROI (though probably not that much).

From a perspective of AM shareholder situation is a bit different because buying AMhash helps AM to resurface as successful operation. So, an AM shareholder buying AMhash while retaining realistic chance to earn a few coins effectively gives AM a hand. Frankly, the last conclusion increases my personal risk tolerance.