Take these users in the Persian IT Proposal:
alt text http://www.juanformoso.com.ar/images/sympathy.png
Although I know you can type whatever you want, or nothing at all, those "reasons to commit" just feel wrong to me.
Perhaps we need more information on the FAQ or an official reply to this question explaining what it means and what is expected from us once we commit.
At least these two users won't be able to help if the site reaches the beta stage, and also, it messes with the benchmarks the team is trying to get at this stages from usage data.