On living off the investment .. or makin your money work for you ..
3 million in a basic savings account will net yearly dividends even at 2% return to provide a decent living. (60k/yr)
5 million will keep you in six figures at 2% return.
That's all I would need.
Most decent investment houses today can get you a bit better than 2 percent return, even in the crappy markets of today

So ya .. even the 'basic' lotto would do the deed just fine.
As has been said, anything above what it takes to provide a decent living is icing on the cake.
We would also be givin most of it away to charities after family are set
..ASPCA Food Bank, etc ..
..and aye I would be buyin a few toys for friends and I.. just because I could.
Wife and I have picked the Powerball to play, 1 ticket for every draw, for years now.
Idiot Tax? .. well ..
..it's worth a dolla just to lighten up a bad day by thinkin of what would happen on the first day we are told we won.
One o' these days .. -evil grin-
If it's a ridiculous amount I would prolly buy everyone in our Vette club a tax free ZR-1, just for laughs

And of course, Aces High Conventions would be a bit more fun

Can you imagine raffling off a P-51D as a door prize, all taxes paid, 10 year maintenance contracted for, pilot licensing paid for, etc?
I can.
-Frank aka GE