How high does the Mega Millions jackpot have to be before it becomes statistically profitable to buy a ticket?

12 million.... the jackpot just hit and it is on a hot streak so it is likely to hit again...lotta chumps out there not willing to waste a dollar on a measly 12 million jackpot so now it is likely to only have 1 winner. now , if you should happen to match 3 numbers you are personally on a hot streak so if the mega millions is still under 20 million the next time play it again....my theorem is dead on and I challenge any mathematician to dis-prove it