Sega of America has come out and admitted that the Virtua Fighter 5 release on the PS3 was rushed to market and needed more development time.
The VP of Sega of America Scott Steinberg stated that the PS3 version of Virtua Fighter 5 was rushed to market to get out within the launch window of the console.
That was the big reason as to why the Xbox 360 version has online play functioning while the PS3 version has no online play anywhere to be found.
Steinberg stated that Sega "wanted to go to market quickly with the PS3 SKU" in order to release it within the console’s launch window, so that console missed out on the online fun.