GEMMA, Not sure what you are trying to say. The questions are applicable if you have an IMC or not.
What we are trying to establish is what the IMC is used for, if people have access to an IMC capable aircraft. If they don't have an IMC and are planning on doing one then the answers are just as valid. If you don't have an IMC and are not planning on doing one then you can answer no to all the questions or not bother doing the survey.
The filtering of IP's is not the only part of the duplicate checks and even AOL gives individual IP addresses. Even those coming from corporate firewalls where a small number of IP addresses are used on the front end have unique NAT data as well as the cookies that are dropped. It is not perfect but it is designed to catch the accidental duplicates etc.