So I went to PGATour.com and looked at the stats section for the last 5 years.
Specifically I wanted to see of the players who finished the year in the top 10 in GIRs, how many wins did that group of 10 guys have in that same year.
2011 - 3 wins total between 2 guys, the other 8 have 0 wins, (2 by Bubba Watson, 1 by David Toms)
2010 - 0 wins total between 10 guys
2009 - 0 wins total between 10 guys
2008 - 0 wins total between 10 guys
2007 - 8 wins total between 2 guys, the other 8 had 0 wins, (7 by Tiger, 1 by Jim Furyk)
In general, other than 2007 and this year, the top 10 guys in GIR were at best "tour veterans". Lots of made cuts, but effectively no wins or top 3 finishes for that matter.
So perhaps it could be said that in general, hitting lots of GIRs does not equate to very many wins.....with the one notable exception of Tiger in 2007.