What about the yous that weren't hit by a tornado? How could you possibly be so doomed that winning the lottery is your best hope of survival? Without knowing it, no less?
Well, to take a theme that's popular with this website, a portion of a sufficiently large lottery prize could be donated to MIRI and allow for the development of FAI before UFAI...
More practically - in most timelines where I don't win the lottery, my general physical location falls within astonishingly predictable bounds, and any disaster that happens to hit within those bounds will trim those timelines from the group of timelines in which I continue to live. A lottery win is one way in which I would gain enough resources to get kicked out of my current parameters, and do things such as traveling places I otherwise would never go.
I haven't been able to find the source of the idea, but I've recently been reminded of:
This is, of course, based on the Multiple Worlds Interpretation: if the lottery has one-in-a-million odds, then for every million timelines in which you buy a lottery ticket, in one timeline you'll win it. There's a certain amount of friction - it's not a perfect wealth transfer - based on the lottery's odds. But, looked at from this perspective, the question of "should I buy a lottery ticket?" seems like it might be slightly more complicated than "it's a tax on idiots".
But I'm reminded of my current .sig: "Then again, I could be wrong." And even if this is, in fact, a valid viewpoint, it brings up further questions, such as: how can the friction be minimized, and the efficiency of the transfer be maximized? Does deliberately introducing randomness at any point in the process ensure that at least some of your MWI-selves gain a benefit, as opposed to buying a ticket after the numbers have been chosen but before they've been revealed?
How interesting can this idea be made to be?