One reason: They give good copy and they say the things that others are too afraid to say.
Here are some gems from legendary author, motivator, Web guru Guy Kawasaki from his interview with the Wall Street Journal this week (subscription required).
"During the dot-com bubble, you needed $5 million to do stupid ideas. Now you can do stupid ideas for 12 grand."
"If you raise $2 million from VCs, you have to pretend like you 'know' all this stuff. The truth is whether it's $12,000 or $2 million, you really don't know. The only difference is what you think you can admit."
and one of his quotes from the speaking circuit:
"Those who can, do; those who can't, motivate."