Gotta kind of figure out these things for yourself in life.
I used to fill out a lot of surveys and write a lot of letters. Took me awhile to figure out that it wasn't particularly useful if no one really listened to them (unless it made me feel better about something or other). Even if I got a nice looking letter back which said pleasant things.
So now I only write letters and fill out surveys to entities genuinely interested in what I might have to say and who might do something as a result of it. It's a waste of my time and effort otherwise (and might create false expectations).
Guess you'll have to figure out for yourself which are worth filling out and which are not.