$1billion
Access. You now can just ask your staff to contact anyone and you will get a call back. I have seen this first hand and it is mind-blowing the level of access and respect $1 billion+ gets you. In this case, I wanted to speak with a very well-known billionaire businessman (call him billionaire #1 for a project that interested billionaire #2. I mentioned that it would be good to talk to billionaire #1 and B2 told me that he didn't know him. But he called his assistant in. "Get me the xxxgolf club directory. Call B1 at home and tell him I want to talk to him." Within 60 minutes, we had a call back. I was in B1's home talking to him the next day. B2's opinion commanded that kind of respect from a peer. Mind blowing. The same is true with access to almost any Senator/Governor of a billionaires party (because in most cases, he is a significant donor). You meet on an occassional basis with heads-of-state and have real conversations with them. Which leads to
Influence. Yes, you can buy influence. As a billionaire, you have manyways to shape public policy and the public debate, and you use them. This is not in any evil way. the ones I know are passionate about ideas and are trying to do what they feel is best (just like you would). But they just had an hour with the Governor privately, or with the Secretary of Health, or the buy ads or lobbyists. The amount of influence you have can be heady.
Time. Yes, you can buy time. You literally never wait for anything. Travel? you fly private. Show up at the airport, sit down in the plane and the door closes and you take off in 2 minutes, and fly directly to where you are going. The plane waits for you. If you decide you want to leave at anytime, you drive (or take a helicopter to the airport and you leave. The pilots and stewardess are your employees. They do what you tell them to do. Dinner? Your driver drops you off at the front door and waits a few blocks away for however long you need. The best table is waiting for you. The celebrity chef has prepared a meal for you (because you give him so much catering business he wants you VERY happy) and he ensures service is impeccable. Golf? Your club is so exclusive there is always a tee time and no wait. Going to the Superbowl or Grammy's? You are whisked behind velvet ropes and escorted past any/all lines to the best seats in the house.
Experiences. Dream of it and you can have it. Want to play tennis with Pete Sampras (not him in particular, but that type of star)? Call his people. For a donation of $100k+ to his charity, you could probably play a match with him. Like Blink182? There is a price where they would simply come play at your private party. Love art? Your people could arrange for the curator of the Louvre to show you around and even show you masterpieces that have not been exhibited in years. Love Nascar? How about racing the top driver on a closed track? Love science? Have a dinner with Bill Nye and Neil dGT. Love politics? have Hillary Clinton come speak at a dinner for you and your friends, just pay her speaking fee. Your mind is the only limit to what is available. Because donations/fees get you anyone.