You may assume that would happen, but unless you really have a thing to show off, you'll keep a similar lifestyle and just watch your savings account growing. I know very few people who permanently changed their behaviour after a sudden change in their earnings. This is of course just anecdotal evidence.
But I am clearly not talking about lotto-winners, but someone who gets 2x salary, who may behave weird first couple of months and then becomes "normal". I fully agree about the lotto winners though. I had witnessed it actually as my school friend's parents won. For lack of a better description - they have become like animals with unlimited money, but money ended quickly though.
What do you think a billionaire does with his money? How much shit can you buy before you simply, run out of shit to buy?