How much will Halo 3: ODST sell FW, End of 09 & Lifetime?

[Zizzla_Rachet]

mr_gappy said:
1 million fw 2.5 million end of 09, people will rather buy modern warfare 2 thand odst and this will damge sales, this game doesnt have the finish the fight of halo 3.

SO Halo 3 does not sell 30k+ every month?