Then you are in luck, because these numbers exist! They're called "tie ratios":inglioti said:Audiences differ so much it's not even really comparable. It would be interesting to graph the number of consoles sold versus the average number of games sold per platform.
For example, I know thousands of people who have Wiis, but most only have one or two games. On the other side, I know less people who have Playstations and xboxs, but know that they consistently buy games for them.
The hardware to software tie ratio shows how many games a system owner buys on average. A system's tie ratio is Total Software Unit Sales divided by Total Console Unit Sales.
The article is a great read on the current scenario if you're interested in sales figures, but if you're not, the abridged version is below it:
http://www.gamasutra.com/view/feature/6350/npd_behind_the_numbers_march_2011.php?page=3
As you surmise, Wii is the weakest at 7.2 games per unit owner (and that number has been growing now that the Wii has essentially stopped moving off of retail shelves - it used to be ~6). PS3 is next with 7.8 per owner. And 360 is averaging 8.9.
In English, your average 360 owner has nearly 2 more games than your average Wii owner... although it's probably more, since 360/PS3 owners have a much larger online game catalog than the Wii does, and downloadable game purchases aren't included in these figures.
Hope that's what you're looking for!