Why start at zero?

Customer Survey for Science World

I am intrigued by surveys. Some of them are very confusing. Some don't collect enough information, or offer the respondent enough reporting options. This survey seems to suffer from the opposite problem.

Customer Survey for Science World (Detail)

This survey, on the other hand, seems to offer too many options. Do customers really break down their likelihood to recommend Science World into 11 levels? Is the zero (0) really necessary?

Too few options is a problem in surveys, but I think this one goes too far in the opposite direction. Five or six options would probably be just fine.