I can see it - but if we expand this argument to talk about half a season (so we have some "relevant data" to begin with to get your initial data), even a 0.1 difference per game - can translate to 4 wins over-all... might still be worth doing it.
A long time ago I did a study of the relationship between team point differential and seasons wins minus losses. I took about 10 or 15 seasons of data and did a scatter plot in Excel. The plot looked farily linear so I had Excel fit a line to the data. It turned out that each point was worth about 2.5 extra wins (something around there don't remember exactly). So 0.1 points is not going to result to 4 wins over a season in normal cases.
