Just a quick tip here:
Recently, while trying to gather guild signatures for a new alt guildbank, I found that (on my server at least) it was much easier to gather the signatures by randomly spamming guildless characters with the guild charter than it was to actually shout in trade chat that I was paying for signatures. I was offering 5g and later on 10g and was getting no one to bait that way. So I ended up paying less than my original expectations as I listed on my Guild Bank Pricing Chart
