You need an option that says "I am more likely to notice award winning games". =)
Not because I intentionally search for those, but because stores tend to use them to attract sales of the product itself and the store as a whole. "Look, we sell award winning games. Here's some. Buy them. They're awesome".
I don't know if that makes me more likely to buy them, but it does give them immediate publicity. It makes me more likely to know about them. That's the first step in generating sales through addvertising.
Based on most of the answers thus far, I think it safe to say that winning an award is far more beneficial than not for a game or product.
While there are those that ignore awards, or who are not aware of them the number of people who are less likely to look at a game because it has won an award are statistically insignificant when compared to 1) Those who actually want to examine award winners and 2) the positive word of mouth generated by the fact an award has been won. Even those who look at award winners without buying them, I would suggest, play into that second point, helping to generate and maintain the positive word of mouth that will result in more sales.
Or, in other words, a company can only gain from being part of the award process. Its hard to see a downside.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.