I have a friend who is a level 80 carpenter who is displeased with the prices of furniture. But that's why he made a jeweler and an alchemist. I honestly don't know why he bothered to continue leveling his carpenter after he knew it would make him no money except sheer stubborness.
I'm a decorator. I hate tradeskilling, and I have my carpenter skill up to level 40 and will eventually make it to 80, very very slowly, only because our two level 80 carpenters are not ALWAYS at my beck and call! How dare they be absent from my grasp when I need them! I actually started out as a tailor and had that up to 38 back in the mean old days of crafting when we were all interdependent, thus my lifelong hatred of crafting. I know it's not the same, I simply find crafting unutterably boring. Decorating is very fun, though! If I had an unlimited budget, I would always buy off the broker, but though I know that someone is often making only a five to ten gold profit per piece on something, when I'm buying ten of them, that adds up fast. Or twenty. Or thirty.... Sometimes this even drives me to make them with my own lily white hands.
Attuning furniture would kill a large part of the game for me. Though this is my main decorator, I do decorate with whichever character is most convenient on occasion. And furniture is swapped among my characters extremely frequently. It's a pain enough to get the truly notrade items from quests into the houses, and to remember who has what....I can't call myself the most organized fury in Norrath. I can't imagine trying to deal with attuned furniture in any reasonable way. There is simply no easy storage option for attuned items just to start with, especially if you're decorating in a city of the opposite alignment. I know I'm not alone in slapping huge numbers of things in broker boxes for ease of access. Really bad idea.
I guess what I'm saying here is that the main market for much of the crafted furniture off the broker to begin with is decorators. Very very few of the players who want simply status do anything but commission items from guildies when they first purchase a house. They get a bunch of rares and say make me ten swiftcloth carpets, please. And a bunch of those cool looking tapestries. And here's some cheap xegonite for some statues. That's what my boyfriend does when he gets a house to sell from. Not to mention there are enough of those relatively high status reduction quested items that he collects from an alt or two to slap in the basement. Heck, now you'll even be able to make those birdbaths a reasonable size with scaling. It might even BE a birdbath size. All that attunement will do is kill the market for the common items and the lower end rares that aren't used for anything but decorating, the things people like to buy in bulk. I certainly wouldn't be paying plat out like I used to if I knew that the item would end up attuned to the house I was putting it in once I placed it. And it is nothing for me to fork over 20 plat a room when I decorate, and that's keeping mainly to commons. I was looking at Tock's Ossuary and trying to figure the cost of his bar.....all I can say is, WOW.