Nah, honestly anything better than the bottom-of-the-barrel acrylics is going to add up quickly when you buy enough of it to make something like a sweater. If you want to use natural fibers (wool, cotton, I'll take bamboo too) that's a large jump in price, even if you're not getting anything too fancy. And I feel like if I'm going to spend months hand-knitting a sweater, I don't want to end up with something that's all plastic and will degrade in a year.

I do also have some fancy hand-dyed yarns that were properly expensive and these ones are indeed 100% on me :P But they're not really what I'm talking about here.