Anybody you contact can reply to you, whether they are paying members or not.
I am a non-paying member, myself, because what I am looking for is not readily available; it'd be a waste of money for me.
In the last several years, here, I've only seen just a few individuals (who live close enough) whom I am interested in working with.
This is just me, 'cause I'm looking for a unique blend of musical interests, adaptability, creativity, and experience. And they need to have compatible goals. And - they ALSO have to live within driving distance.
Translation, for me: Zilch.
Man, that was sure making a short story long, eh?
ANY-way . . .
I've been contacted several times, and, once contacted, I'm able to always contact that person back . . .
So, if people aren't responding to you, then it's probably because"
A) They didn't get the message yet.
B) They're still thinking about it
C) They're jerks
. . .