OP here--it's fun to see the DCUM is divided on this. I think we're going to go ahead and do it. As with all houses, some people will love it and some will hate it. The W/D hook up will remain in the basement. If the buyer hates the W/D on the main level and wants to move the units to the basement, they can. Then they'll have 4 bd upstairs and 1 bed down.
I like the suggestion of extra storage. We'll probably add some open shelving. What's funny is that my DH (and the architect) completely forgot about a linen closet

. When I asked where I'm supposed to put the extra blankets, towels, and pillows, I was met with blank stares. Obviously these men have never had to make beds for overnight guests! With a whole room, albeit small, I'll have lots and lots of linen storage.