As if dealing with all these wankerly types isn't annoyance aplenty, it's not enough to simply endure them. In order to part them with their money, you've got to be charming, friendly, warm, and sexy. You should be able to talk about anything they wish to discuss, whether you know anything about it or not. You can do this by bullshitting effectively, or, if it's something you can't pretend to understand, you can do it by hanging on their every word. Ideally, of course, you are as educated as possible in as many fields as possible...and witty enough to poke fun at yourself when you find yourself ignorant.