>>>Now if I understand this correctly, once you do this the items for sale in that container can be purchased both directly from the house and over the broker as well?<<< Yes. People can purchase your items directly from the broker as usual. As well, on the broker listing for the item it will say "Visit XXX at XXXXX" (for me it says "Visit Karlen at 5 Karana Court, South Qeynos"
. People who wish to save the broker fee can go to your house and click directly on the sales display to bring up a merchant window. Make sure you place the sales display somewhere that visitors will be able to find it. It is really annoying when you have to search a house and look under all the beds to find the person's sales displays. Try to put them right next to the door or straight across from the door (so you will see it when you zone in).