[mhb]

The rules also mention:

If the total prizes won for any drawing, exceed 200% of the net sales for that drawing the prize amounts will be based upon a formula detailed in the Rules and Regulations or Administrative Bulletins issued thereunder.

which has to add a little FUD into the thinking.

[bumbledraven]

Yes, although historically it's clear that the payouts make it profitable to buy tickets on rolldown days, the actual formula used to calculate the payouts was opaque. I heard that one of the lottery syndicates actually made a request under the Massachusetts Public Records Law to get the lottery commission to reveal the formula, which they eventually did.