Most FPs I am in for the Comms at the end, and when I get in the group I usually start with "Hello, Speed run?" and most will say Sure.
I was in a run of T5 and we skipped everyone, and at the last Conversation one of the guys asked why we skipped everything as he needed gear.
with a PUG I tend to state at the beginning what I am expecting from the run, and if someone does need gear or wants to watch, that is fine but please speak up if everyone is saying that they want to skip.
On the other side I have brough guild members through FP when they first turned 50 and I said at the start "He is a new 50 and we are doing a full clear to get gear."
Only a few times have people dropped group because of that, most people stayed.