Mine spend most of their day in the coop and I have about 10" of bedding in there so far. I would argue that it's LESS costly than laying a thin layer of shavings and cleaning out completely because once the poo dries out, it becomes bedding itself. I only add now a few handfuls occasionally for a fresh layer. While I was searching on the vary topic, I came across a quote (paraphrased) that pretty much sums it up: If you have to mess with the bedding, you're doing it wrong.
It sounds gross but it really isn't, surprisingly.
The bedding itself does not stink at all. If it stinks, it's either because someone left you a nice fresh cecal poo nearby or you have a water leaking making the bedding wet. The pine shavings help dry out the poo, and the air pockets it creates help dry it out fast. The smell is from the ammonia in wet poo, which will evaporate quickly enough if you have adequate ventilation. Diet has impact too... wet poo generally stinks more. I live in the pacific north west so even with our humidity DLM is working well.
My coop is 4x5, and I just started with 3-4 inches so that they are walking on solid shavings instead of ground, which is the same thing I did when I had them in their 2x4 brooder. I'm composting everything they did in the brooder and I plan on cleaning the coop out either late fall or early spring, or basically twice a year. I just happened to start them in the coop in between seasons so it's something I have to decide here shortly.
The girls love it. I watch them from work all day and they spend time working/turning the bedding or roosting among the various perches when they're not laying me eggs.