this seems like a sneaky way to get me to do the forum searching for you :)
which I did... the only thing I can find while eating chicken is a post from weena in
this thread
I wouldn't consider proximity a factor in deciding who to recruit at all. The impact is minimal. According to some estimates, it is roughly close to the cost of one home visit. The breakpoint for home/far away is 300 miles.
although kmason responded that he thinks the far away preference is more significant...
I personally have no idea, and I pay absolutely no attention to proximity preferences when decided who to recruit...