Based on Wikipedia's best-selling games list (which appears to be reliably sourced), the number of 5 million+ sellers on each system this gen are:
Wii - 15
360 - 9
PC - 5
PS3 - 3
In other words, the Wii and 360 both had more 5 million+ sellers than the PC, while the PS3 appears to have had fewer 5 million+ sellers than the PC.
Slight correction... Change that to 5 for the PS3. The Wikipedia list doesn't take into account the total sales for MGS4 or Uncharted 2 (both of which exceeded 5 million), which was posted in this thread a few pages earlier. In other words, the PS3 and PC appear to be on par in terms of 5 million+ sellers.
Whilst you are proving that it happens -- which wasn't contested -- you aren't proving that it happens routinely. Of the, nigh on thousands, of titles released this gen... 27 does not really convey a "routine" or "regular" occurrence.That's what Lazycloth claimed, not me.