What if you're not an entrepreneur, but you'd like to be one some day, and you're overwhelmed with the sense that you're more intelligent than the majority of the population? Should you write then?
Suggested post #1: candid thoughts on why I still work for people dumber than me, and my plan for changing this. (It isn't wrong to not have a business, but if you aren't starting today, have a good reason for it. "I like eating" is a good reason. "gtg WoW raid" got radically less persuasive after I thought about it for a while.)
Absolutely do! There's nothing more refreshing than reading the blog of someone just starting out, like Patrick (patio11) when he started his blog. As much craziness that happened this weekend about him and what he should and shouldn't do, he continues to lay his business life bare and is as candid about triumphs and setbacks and problems as one can be. I'd love to read a book by Patrick when/if he ever cares to, but if he doesn't, his blog suffices greatly!
And, about the other thing: As long as you realize that even though you feel you're "more intelligent than the majority of the population" you, at the same time, realize that there a metric _boatload_ of people who are smarter, more successful, more insightful, and better at expressing themselves than you, you'll do great! Confidence + humility + honesty = a great path to success. There isn't one person that would dispute that.
Even if that is so, you're not gonna have all the insights, experience, knowledge, training and divergent thinking openend to you till you have an audience, peer group, whatever, going over your thoughts. Half-jokingly, one other downside to being so intelligent is that you tend to discount all the things that obviously won't work. Some of the 'less intelligent majority' might offer something seemingly obvious but just might work. See the whole crowd outperforming single experts in certain areas research.