If you have trouble finding the store policy it is here. I had to search for it. I suppose it came unpinned?
Old Timers Guild Store
Items are to be sold at or below recommended price (This is generally three times the vendor price)
Store will only be available to guild members
This store is to be used by those who wish to provide other members with cost effective items in order to assist other guild members
T-Maps they may be sold for no more than 100 gold per map.
Crafting Mats that have 0 value may only be sold for 25g per or lower.
Note: Guild Merchant automatically prices items 3 times the Vendor’s recommend price on item’s with a gold value.
I dump excess recipies here that my alts can’t learn at the suggested 3x vendor. Go there for cheap provisioning recipies!
Old Timers Trading Store
Items sold may be priced at the seller’s discretion
Items are for sale to guild members and non-guild members, dependent upon store availability as permitted by Zenimax
Store will be available to non-guild members via Cyrodiil forts and/or Guild Merchant once they are available
I treat this as a regular trading store.