They do not trust me (why would they) and they think it's a sales tactic. I couldn't be purer in my intentions, but people are on the defensive.
And your pain point is actually one I've heard firsthand. Got a few ideas and connections in this area.
I'm not trying to be rude or insulting, but thinking you have pure intentions doesn't change this.
Some people might have the time or interest in the hope that you can one day make their work easier. So overall I understand why you are asking this question and I'm sure the advice people have given here will help you make some stronger connections to people in this cohort.
On the other hand, if you write me a longer message, explaining your background and position, give me all the background info, and let me answer via email, I might be more inclined to help, assuming you demonstrate that you at least have some understanding of the field.
Alternatively, you could offer to pay people for their time, which is not something sales people typically do.