Not all real estate questions are "location specific, and any agent can answer them. So an east coast agent answering a question in Reno is not pointless.
Brownie points? No, there are no Brownie points for answering questions. We try to be helpful for many reasons. Some do it for altruistic purposes, others do it for the mental exercise, and some do it for the exposure.
I answer questions because I find it rewarding.