In this example I'm sure it wouldn't cost $800k to rebuild the house, but it'd certainly be more than $40k, so it would definitely be a loss.
Lets say I bought a lottery ticket for $10 and my ticket wins and I can go pick up $200 million. On my way to the office of the lottery place I lose the ticket somehow, then I am not out $200 million, I just don't have it anymore, but it isn't as if suddenly I can't lead the same life as before I bought the ticket.
Lets now say that I just bought a huge number of toys for all of my life savings to sell in the holidays and then the uninsured warehouse where I stored them burned down, I actually lose all of my life savings and I have to sell the house, my car, lose the kids, etc.
I am not saying it doesn't suck, I am just trying to discover the context.
If they took a loan or put all of their life savings into it then it feels a bit different than turning $50 into $500000.