Something simple just hit me. That "50%" isn't just 50%. After all, she got with you during the peak years of your earning potential. By the time you got married to her, all of the difficult years are over where you had to study/train, and hone your skills as you crawled your way up to a decent income level.

If you want the real value of what she took from you, you need to take into account all of the sacrifices you have made over the years to reach that peak income.