Grand Theft Auto IV has sold $500M worth of games in its first week of release. For comparison, GTA IV sold more copies in one day (3,600,000) than HALO 3 sold in its first week (3,300,000). That figures to a $500M first week for GTA IV compared to HALO 3's $300M.

The numbers are staggering for the dual platform GTA IV which was released in a PS3 and XBOX 360 format.

We know 6,000,000 copies of GTA IV were sold in the first week. VG Charts estimates that the XBOX 360 version sold 3.3M units versus 2.6M copies for the PS3 version. Those are pretty close figures considering that the XBOX 360 has sold 6M more consoles than the PS3. Evidentially and not surprisingly, PS3 owners are loyal to the GTA series.

And is Microsoft regretting not expanding the HALO universe to other platforms?

Perhaps the development costs of making a version of HALO 3 for the PS3 wasn't feasible. Okay.

But what about say Halo 2 on the PS2? There are an estimated 50M PS2 consoles out there right now compared to just 17M original XBOX consoles.

Obviously, there was a massive install base. After they see GTA's numbers, is Microsoft regretting making HALO exclusive to the XBOX family?