$1k cash if you bust him in the face on camera. 
I'll even throw in a large order of Orange Chicken from any restaurant you want.
I am an equal access photographer at these events, unless you don't want me taking a pic. Trust me, I have more than enough people, various booths, officials, celebrities and vendors to take pics of. When I am contracted or on assignment, then you need to take at least 1 pic of a compiter, but rarely have I heard don't take it. If someone is that 'stuck up', I really don't want to give them any publicity anyway.
Quick funny, though, in the last few years, i have received more complaints as to why I did not take their picture, or 'ignored' them. It isnt intentional either, you just have limited time to get pics in various areas before you move on.
The Olympia is an awesome event, one of my favorites, because not only do you get to meet various competitors, you get to see vendors, and old friends from all around the globe.