Good Idea - Having an altar at the end of the raid so people can reward themselves with a very nice item.
Bad Idea - Having two other altars in the very middle of the raid so 10 people can wait around for 20 minutes while one person looks through his inventory, figuring out if he has enough ingredients, and then another 10 asking other people for the one ingredient he's missing, and then looking on all the websites trying to figure out exactly how his item is supposed to upgrade.
Please put the first two altars in Meridia.
Thanks.