That's because people didn't buy PS3s. And if they did, they probably only own Fifa and Pro Evo.
I own a PS3 and I've never even considered getting a soccer game, I bought it for stuff like Uncharted, Little Big Planet, MGS4, and free internet gaming. And also so I could have a reliable system that wouldn't have a good chance of fucking up everytime I tried to play it like 360's do.
I was just making a broad generalisation. When the PS3 first came out when I was working in Gamestation, about 90% of the people who bought one asked when FIFA or any football game was coming out. They didn't care about any of the other titles.