no its not, check the data
https://en.wikipedia.org/wiki/Grand_Theft_Auto_III
"
Grand Theft Auto III was the highest-selling game of 2001 in the United States, selling over two million units by February 2002.
[71] The game was also the second best-selling game of 2002, behind only its sequel.
[72] Take-Two stock significantly increased following the game's launch,
[73] and the game was included in PlayStation's
Greatest Hits selection.
[18] Within a year of release, the game had sold six million copies and generated over US$250 million in revenue."
So according to your numbers the ps2 had ~38 million, 6/38 != 30% , its even less than 20%
mate games just don't sell to the percentages of ppl you think they do
Mate forza is not exclusive to xbox, I can play it on my PC, also weren't you the one starting the mocking so its a bit rich turning the tables