It's the user who creates the first mover advantage by using your site. There's nobody to analyze. We're going to provide a new way of working with the system. If your system is so new that nothing is related to it, there's a big chance that nobody will understand nor use the system. If users can't relate to your product, you probably don't have a market.
Users disagree about what they want.
They all want something different. User requirements analysis is not about asking users what system they want. User requirements analysis is about understanding users' current practices and the problems they encounter. Users are not interaction designers. They often don't know the possibilities and constraints of interactive systems.