You say you're able to achieve 12k over the industry average, and take 7% of the first year salary. It's hard to assess how much of that 12k is due to selection, and how much is due to your work. In other word, what value you actually deliver.
Let's say the industry average is 120k (in California). If you deliver 12k extra, and take 7% of the total, you're actually taking more than 9k out of this extra 12k.