For me, it's definitely the renting aspect. I don't own a home and with my career in its current state, being nomadic is a way of life. With that in mind, I have done little in terms of acoustics. Oh sure, I always use carpeting, hang things on the wall, have big comfy couches and chairs etc. But I know that, once I do buy a place, I will certainly invest some time and probably money into treating the room. Once I know it's mine and that I won't have to break it down and move it every 12-24 months, I'll be a lot more inclined to put some more focus into room treatment/acoustics.