I think my post was a little confusing. Let me try to explain myself better. I'll try to give an example.
Let's say I have an access point where most of the clients are 2-5 miles away. There is a potential customer that lives 15-20 miles away. From his location the signal strength is very decent. My concern is that having a client connect at this distance may negatively impact the clients in the 2-5 mile range due to timing issues?
I am right or wrong to assume that?
There will be an impact, but it's a small one.
It takes longer for the AP to get an ACK from 20 miles away than from 2 miles away.
This is wasted time when it could be serving another client instead.