If aside from entertainment value it makes sense to buy one ticket,then it makes sense to buy two. And three and four. But in fact aside from entertainment value it does not make sense to buy one, because that change from 45,379,619:0 to 45,379,619:1 on a windfall is accompanied by a change from 1:1 to 0:1 chance on keeping your original dollar. And in the vast bulk of lottery scenarios, it all multiplies out to a negative expected return.

Its increasingly lower returns for each dollar, thus I don't see the point of anything above the minimum. The expected return may be negative (further hence the minimum investment) but its negligible.