That's a bit of an oversimplification. Hypothetically if every pitcher in baseball was available via FA this offseason, the list of guys worth Strasburg money is a lot shorter. Off the top of my head: Kershaw, Sale, Harvey, Fernandez, Bumgarner, Hernandez?
Edit: There's probably a handfull of pitchers that in reality are not immediately approaching FA, that in that particular hypothetical would also have to be listed; however, the point stands that there probably aren't 12 pitchers worth more in FA than Stras.