The jackpot at which EV turns positive — compared against sourced historical jackpots so you can see if it is realistic.
Powerball turns EV-positive at a jackpot of about $767,057,081 under these inputs (it starts at $20,000,000).
Largest recorded advertised jackpot on file: $2,040,000,000 — that level has been reached before (sales usually spike with it, pushing true break-even higher). jackpot history.
As the jackpot grows, sales — and sharing — grow with it. Positive EV still is not a reason to play: Kelly says bet nothing.