Part of the problem is yes, people think rules don't apply to them. But I also think part of the problem is that people just don't know. The signs are not very visible. We were there for 2 days and only saw 1 no selfie stick sign.
When we were there 2 weeks ago space mountain was shut down because of a selfie stick right before we got on. There is a sign stating no selfie sticks, but we missed it the first time through the line. The line was moving so quickly we didn't even see it. My sister pointed it out the second time through, after it was back up, but the line was moving slower then. If my sister hadn't pointed it out, I still wouldn't have seen it. The one sign we saw was inside the line, on the right hand side, in the little doorway just before you go into the big loading room. I have no idea if there are other signs, we didn't see any.