@SBB: Oh, the replies are helpful alright. Most people's style is defined by what they grew up with and what their influences are. It's not surprising to see people composing in only one scale all the time, it's pretty normal. I found myself playing in minors all the time.
Then I took theory and some jazz courses in school. I learned some more scales and that opened up a whole new world to me. Sure, I still abuse minor scales, but I have a lot more to play with now.
The problem is that people get stuck with that they're used to doing. Open up your eyes, experiment more, listen to different genres. It'll come to you eventually.