Just wondering how often you think blankets need washing and how do you wash them? I rarely use any myself but my ds uses them all year round.
I've only got single blankets but they vary in size. I gave up washing them in the machine at home after I washed one and the machine walked forward dragging the lino with it. 
I now have a washing machine on a stone floor and it seems fine for the smaller blankets but when I washed a bigger one (still only single) some of it seemed too dry when it came out after just being washed and I wonder if the water only got round parts of it so I think I might have to go to a launderette with the biggest blankets.