Treat buying a PowerBall ticket as entertainment. The Expected Value of each purchased ticket is still less than the price. See Is It Mathematically Rational To Purchase A Powerball Ticket?
I think in the foreseeable future the EV will be less than the sales price. The EV goes up as the jackpot goes up. But as the jackpot goes up, so do the number of participants, increasing the odds of a split jackpot and reducing your EV.