Ferrari thinks he is worth it, so it's fine by me, they pay for it from their own supply of cash.
This is what the other riders earn according to some random unverified source, from march 2012 in dollars.
(Do note that Raikkonen earns per championship point, they expected him to earn 50 points, he earned 207)..
01.
F. Alonso
37m
02.
L. Hamilton
19.77m
03.
J. Button
19.77m
04.
S. Vettel
12.3m
05.
M. Webber
12.3m
06.
F. Massa
12.3m
07.
N. Rosberg
12.3m
08.
M. Schumacher
9.9m
09.
K. Raikkonen
6.18m
10.
H. Kovalainen
4.94m
11.
T. Glock
3.7m
12.
K. Kobayashi
1.23m
13.
R. Grosjean
1.23m
14.
N. Hulkenberg
618,000
15.
S. Perez
618,000
16.
V. Petrov
618,000
17.
P. de la Rosa
618,000
18.
J. Vergne
495,000
19.
D. Ricciardo
495,000
20.
P. Maldonado
495,000
21.
B. Senna
309,000
22.
N. Karthikeyan
309,000
23.
P. di Resta
247,000
24.
C. Pic
185,000