Salaries aren't dictated by how much time you spent in training. They are dictated only by how much revenue you can generate. Which is dependent on 2 things:
How much payors are willing to pay (decreasing rapidly and annually)
How many cases you do.
Translation: To maintain the same revenue, because you are getting paid less per procedure, you have to do more cases each year.
Ultimately the money in the surgeon's pocket is revenue-expenses. Since revenue decreases and expenses increase regularly, you can predict the outcome.
You better be in this for the fun rather than the money.