You also have to consider the fact that a xbox 360 version if released in japan would probably not do much over 300K (we'll find out soon since FFXIII international is a sure shot announcement for 360 at TGS)

So the 3:1 ratio will stay.

I'm not really sure to be honest. I know that the 360 version of Final Fantasy didn't sell as well because of the retarded propaganda surrounding it. Such things as "it is broken", "it runs slower", "the frame rate is horrible and the graphics are horrendous".  You know that kind of BS. But yeah I think Halo will always have a special place in the heart of Xbox owners, but it would sell decent on the PS3.

Well I'm not sure how much of an affect the US ad campaign had on the ratio since RoF had absolutely no advertising and had a similar ratio of PS3 to 360 sales: FF has 1.37 and RoF has 1.22

Then again based on RoF if FF was available on 360 in Japan it would sell about 400k which would still leave the PS3 ahead with a ratio of 2.5 in WW sales. 

This is all of course with the assumption that RoF and FFXIII have comparable sales which while they obviously aren't comparable in absolute number they have similar ratios in the regions that can be compared so I think they're comparable in that way.

It would do half I believe.

i do sort of agree with this, or i think that Xbox360 owners are bigger FPS fans than what PS3 owners are. So i dont think it would sell better. i do generally feel that ps3 owners are more RPG fans than FPS.

for me under one condition, if it gets 64 player multiplayer and dedicated servers with a server list which on ps3 is totally possible, I'll buy it.

but it would do just just fine, and STFU with the ps3 aren't shooter fans crap, 360 has almost double the install base in the US where shooters are more popular and a 5 million unit lead worldwide no shit shooters sell more .... and didn't the VAST majority of FF13 sales come form japan where shooters aren't popular?

Most likely, well under half for most of the reasons already mentioned.

Halo is synonymous with the Xbox brand and I can't think of anyone offhand who loved or even liked the franchise enough to pay money for the games who didn't already own a 360.

It's a pretty safe assumption that barring the few who don't understand the nature of internally developed, platform specific games (exclusives) and their relation to promoting their respective hardware platforms, nobody is "holding off" on buying an Xbox despite wanting to play Halo, because they hope or expect to see the latest Halo game show up on the Wii or PS3.

It would be shunned by the hardcore PS3 fans for the most part, despite being one of the better examples of its genre so most of the sales would go to PS3 owners who simply don't play enough video games to justify buying every single game system on the market so they can play "everything."

The only way a PS3 port could steal any sales away from the 360 version is if for whatever inexplicable reasons, it was actually better than the original.

Would halo reach have a chance to be the best selling fps on PS3?

Well something I've noticed about multiplat games, a game that's a hit on one HD consoles is generally a hit on the other.

Would a Halo on PS3 hit MW2 numbers? Its definitely possible.

if ported (and i know it is impossible) i'd buy halo reach on the ps3.  it certainly looks like a good game. there is only two things that make me not want to buy halo for the 360.

1. i'm not paying for live.

2. i'm a trophy whore.

...but yeah, it wouldn't do as well.  1/2 to 1/3 sounds about right but mind you,...that would still be 3-5 million.