Thanks to Cliff C. at Bronx Banter, we have some stats to compare the recent acquisitions of two Japanese pitchers in the AL East:

             Igawa   Matsuzaka   Delta %
ERA 3.15 2.95 M +7%
K/9 8.49 8.70 M +2%
BB/9 2.86 3.23 I +13%
K/BB 2.97 2.70 I +10%
HR/9 0.84 0.72 M +17%
H/9 8.31 7.07 M +18%
WHIP 1.24 1.14 I +9%
Interesting. The average differential between these two pitchers across all seven categories is just shy of 11%. Now take the total price for each pitcher, and then amortize the posting fee over the life of the contract for the "all-in" price:
Total          46m        103m   M +124%
All-in/year 9.2m 17.3m M +88%
Is it always true that the value of something equals the price that you paid for it?