Four out of ten will give you good information including the stuff you need to know. Some have a different take on certain issues about outsource of IT. Most will end up telling you that same thing as others. This group will give you a solid background on the basic features your outsourced IT program needs to include.
The remaining three will give you a breakthrough of ideas or trigger some amazing ideas that will help you with your reputation of your outsourced IT Company. Based on what you learned from the other seven. This is like striking gold!
Just imagine what the other seven users (that's 70% of your user base) will think when you create an outsourced IT project with breakthrough features that blows away their expectations.