You identified what I call an interesting "mid-band" of wealth, so I'd like to swizzle the numbers a bit more for perspective:
$30 Million is certainly "fuck you" money. Assuming anyone with that amount has 30-60 more years to live (e.g. is 40-70 years old), that means they could spend at least $500,000 per year, or $1,369 PER DAY for the rest of their life.
That is more than my monthly rent. They can spend that per day. And, AND they don't have to work all day. They could volunteer, run propaganda campaigns, get high, research stocks, play guitar, learn Swift, paint, ANYTHING.
Well, except buy a new car every day. If you want a Lamborghini, at ~$120k, you'll still have to "save up" for 85 days! So it's not the absolutely, mind-bogglingly, helicopter-dogfight rich. And you certainly couldn't go nuts with art:
You couldn't even buy the cheapest painting on Wikipedia's "most expensive paintings" list. [0].
[0] http://en.wikipedia.org/wiki/List_of_most_expensive_painting...
Anyway, I'm glad there are less than 170,000 people who don't have to do anything at all to live.