Here at home, as is common in many families in my country, we have a maid. So, eh, I pretty much don't do anything.
When I was living with roommates and with my Japanese family, though, I usually washed everything I could and didn't take much work. With the Japanese it was out of pure goodwill, I just wanted to help.
With my roommates, it was because we shared stuff - just like BoC, they wouldn't really do their share, and truthfully I'd rather do a little work after I'm done eating instead of having to wash when I'd rather just eat.
'Sides, I wouldn't want that crazy Russian girl anywhere near my mugs. She was just.... weird. Oh, and Miss French-Accented-English once bought me dinner as thanks for doing her dishes, so it was cool.