Think what you all will, but people have been robbed and killed in situations like this, just as it could easily happen if you meet somewhere. Yet if this guy is legit, you should be able to tell just during your conversation. Does he know what he is talking about, does he sound like an audio guy or gal !
That said, I have had people here to buy several times, and zero problems. But I am rarely here alone, and I am wearing my CCW. I have met all great people !