I have the psijic potion recipe and normally sell a ton of xp potions and do all crafting writs on 2 characters a day which allows me to have lots of fragments and other high end materials for sale, so the guild makes a decent tax off of me.
When asking others in some of the larger trade guilds about membership they tell me, full, waiting list, people only kicked if they don't sell anything/donate. But is the quality/worth of what they sell brought into question? Technically someone selling green recipes for 1000 gold is selling...
I'm looking for a trade guild that manages to pull a trader in a good location every time. I've been in a few trade guilds that have lost their trader or started put them in bad locations that really drop my sales.