What's a marketing guru?

This marketing stuff is new to me, so I followed a link to an article about marketing guru Seth Godin. I read some of the entries on his popular blog and found it to be well-written and interesting. Cool. So I picked up his short book, The Dip, to see what a marketing guru says about marketing. Two hours later I was finished. I can sum it all up like this:

• Be the best
• Quit when you're not getting anywhere
• Stick it out if you think you'll succeed

Sorry, apparently there are millions are rabid SG fans out there, but I don't get it. I felt like I'd just read an extended riff by Stuart Smalley. Perhaps his other books are a little stronger in content, but The Dip isn't the best introduction to marketing.