It's a fully priced late port of a sequal to a story driven game that we never got.

Read that above sentence again and tell me you think something like that will sell but loads.

I generally don't buy games when I haven't played earlier games in the franchise, and when you're talking about a franchise with a heavy focus on story, then that means I'm less likely to play it.

I bought it for PC. If it isn't a console exclusive I'll never play a WRPG on console.

PC is my platform of choice for RTS-games, Adventures (point&click), WRPGs and shooters (I don't really play shooters -> by shooters I mean stuff like Portal or hybrids like ME2).

My PS3 is mainly used for JRPGs, action adventures, platformers and the occasional sports or fighting game.

@binary solo

I wouldnt wait forever ofcourse but maybe for a 720 Version in 1080p. Depends aslong as I have more than enough to play I can wait. For PS3 I wont buy it but maybe for my Notebook. It wont run away. I played games a decade after their release (properly).

i bought it day one for PS3, it didnt bother me in the slightest little bit that it was a late port and full price! the game was worth every penny, ive played through it twice and enjoyed it massively both times, i really cannot wait for ME3.
So as the OP states, WHY havnt PS3 owners bought it (except for the 500,000 that have). If you was using the excuse of it being over priced you can easily find it for half that price now so go out and buy it. Mass Effect 3 will be a nominee along with Skyrim for the BEST GAME OF THIS GEN. So dont miss out on the build up to it.

Like others have said, it's the second part of a story driven series and many PS3 owners didn't get to play the original. It's a late port being sold at full price.

Suddenly, it makes sense why Metal Gear Solid 2 didn't sell very well on the Xbox 1. I have high hopes that PS3 owners will embrace Mass Effect 3 (don't let me down, guys!) just like I hope Xbox 360 owners will embrace Metal Gear Rising (don't you guys let me down, either!), though.

I played it on PC.

I never expected the game would go to PS3 and still feel to this day that it was the best game 360 had that ps3 didn't. Still I do not consider myself a PS3 gamer only and never would want to be. I like my 360 shooter box. :)

Late port + incomplete saga + available on PC.

To be honest I'm surprised it sold this much. 22% of X360 sales is quite good IMO.

I somewhat disagree too though because other WRPGs like the Fallout series, Elder Scrolls 4 (and 5 will as well) and Dragon Age have had either great or good sales on the PS3. The audience between the PS3 and 360 really isn't much different now especially since Western devs have started picking up in the quality of their games.