My family fleet includes bikes that are used during the winter on salted / sanded roads. Over the space of a decade, we've worn out exactly one rim, on a bike whose brakes were neglected and loaded up with grit by going through a construction zone every day. We were lucky to find a rim with the same ERD, just swapped it in. Building a wheel does take some practice and patience, but is not too difficult if you start with a new rim that's not already warped, and follow decent instructions or a friend who has done it.
I don't sweat it. With that said, my dedicated winter bike now has a coaster brake.