Very true, if the ppl asked are into different musical styles.
I bought a pair of EMGs about 6-8 months ago, through eBay. I had no way easy way to get to play with such pups, but I asked for opinions on a metal/guitar-oriented board, and asked only those who had experience with the pups to reply. I got a few answers, saying that the pups were great. I bought them, and, well, they were great.
So I figure a good thing when talking about sound and stuff is stating what music your into, what sound you want, what you think of famous ppls sound, and so on, to give ppl an idea of your frame of reference.