There are anomalies on both sides of the spectrum. I really think that whether low IDs are better builders or not has less to do with their actual skill but how much we here from them. For example, in the 100-1000 range the builders that suck have either faded into obscurity or left because this game's real fun is in building. They also have more time to improve on their skills. However, the newer members, while their are some exceptions, generally suck.
For example, I got this game in May of 2008. This was basically the first build I posted pictures of.

Now just think of some of my recent accomplishments, which I won't go over.
So, if you're around for a long time you either get good or you fade into the shadows where we don't hear from you too much.