I am surprised a 'want to buy' would use acronyms - there could be a newbie (or an oldie) out there that collects in another area, but has some signs that he or she might part with, but has no idea what you want...

Selling or buying you want to reach as large a group as you can, and sticking with just the guys 'in the know' (the acronym club) might make you miss out on a real catch! Ya' never know...