Perhaps. I like to think that people who see my photo are thinking something along the lines of: "that guy's attractive". It's useless to lie about it. However, I don't send my picture to people with the sole purpose of extracting a compliment. Showing someone your picture is a sign of trust, and in some cases, in can help you to get to know the person a little better.

Compliments are nice to hear, no doubt, but I'm sure there are many people who don't post their pictures in order to fish for compliments.