I always love hearing tips I've never heard about something I use all the time, and Nibuca at Mystic Chicanery posted exactly that. Auctioneer apparently has a listening module called AskPrice (enabled by typing "/auctioneer askprice on" when the addon is loaded up) which will allow other players to use a trigger (? is the default, as in "? [Wolfrunner Shoes]") to find out your Auctioneer's price via whisper. And you can set it to listen in guild chat as well, so as a guild officer or leader, you could easily and quickly answer all those "what's this worth again" questions.
I'm not sure how exactly it gets around the no-spam requirements on sending so many messages at once (although spamming is "allowed" in some whispers and chats), but if this is something that pops up in guild chat or among your friends really often (and there is someone online enough to be around whenever this question is asked), this is handy little tip for something that you probably already have installed. Very nice.