[fchu]

I think you could flip the status quo on its head, by promoting a full 10M (or 5M...), and making it clear it is NOT the annuity value sum like you do for lesser prizes, since I would argue that your competitivity/differentiation comes from the fact that you don't lose money to play.

Also describing the lottery mechanism without any gotcha is the right thing to do for consumers, and being in the unique position you are, you have the opportunity to lead that change.