You may improve the results if you started at $30k and went in increments of $10K. I doubt anyone is making $30k, but it is possible that people at the lowest

You may improve the results if you started at $30k and went in increments of $10K. I doubt anyone is making $30k, but it is possible that people at the lowest level listed may not even click the arrow. If they feel like there are people coming in below where they are, they may be more likely to. If nothing else, it makes the distribution seem to make more sense.