No sleeves here either.
I have a bazillion sets of beater lines over the years that have gotten wound up on my handles, wet or dry, and I dare say I've not had any line breaks as a result. The breaks have come from other foibles but not as a result of no sleeving.
Also, Sleeves just get in the way of my 10 thumbs ( which may explain my inability to fly Revs!). But really, I've found, FOR ME, sleeves always end up bunching up or fraying or slipping, or something that makes me say, No More Sleeves!.