One of the reasons I don't have a profile photo is that I'm in the media where I live. One day I'm trolling for dates on Real Jock, the next day I'm seeing the job of a lifetime jeopardized because my boss figures I'm wanking on cam for every Tom, Dick and Obscenewish.
Anyway, when I first started seeing my photos appear in print media, I realized that I clenched my jaw every time someone tried to take a picture of me. It actually took a little while to figure out how to look relaxed and nonchalant in front of the camera.
I don't think it's odd for people who don't spend a lot of time staring at their own photos to take dorky photos. That grade two, clenched-teeth smile just makes a guy look unaware of his flattering angles. He's probably spent less time in front of the mirror than me. Sometimes, that's a good thing.
By the way -- before my reply derails the topic of this thread -- I've shown my photo to tons of people who have asked to see it.