What do the rich buy that the poor don't even know is available for purchase?

Elections seem to be the most obvious answer for me.

Auto accident liability self-insurance with a large enough escrow acccount (which can still be invested and is yours). You'll also get a fancy small window decal, at least in CA, telling the world this fact (self-insured and registered to the state)

It's not super-rich, but I've only seen people with net worth >$2 million do this

Blood. </sarcasm>

Lots of little things. I have real-life experience with Terry Pratchett's Boots Theory. (I don't know if it had another name.)

time