It's not hard to spend $100,000 ..... but what is hard is spending $100,000 a day. Keeping in mind that when we dreamt up this exercise it was the '80s and things were cheaper.
Buy a car. It's going to take the better part of day to buy a car in that price range. Lets say you go all out and get a $125k car. Shop and test drive one day. Take delivery the next day. Now you have another $75k to spend. Go clothes shopping. If you manage to spend $30k on clothes (!) You still have $45k carrying over to the next day. Even if you have blow out dinner.
Next day, go house shopping. It takes a week, minimum, to close a deal - even if you find what you want on the first day. So, the house had better be at least $700k.
Ok, now what? You own a house (or you will in a week) and car, spiffy threads.... So you go travelling. Count on a day to get from your home to London, NYC, Paris, Toronto, Berlin, Tokyo, HK, etc. Remember, while you are in the plane you are still getting that $100K, and no matter how much the 1st class ticket, hotel, limo cost... it ain't gonna be no $100k. More to carry over tomorrow.
I'm not advocating this as a meaningful way of life. My point is that us plebes are not bred/trained/taught to spend this kind of money on an ongoing basis. Oh, we can figure out what to do with $40,000. But if we ever got our hands on real wealth we'd have a much more difficult time dealing with it.
Oh, that's easy. Go to a big, expensive bar, and order rounds for the entire bar. Repeat as necessary.