A $500k house in my neck of the woods means a dilapidated outhouse on a 3,000 sft lot covered with weeds! 
Just kidding. There are NO $500k houses in Seattle. Just studio condos.
That said, if OP’s home is on the mid-higher end, buyers will definitely expect to see a nicer backyard. We have a large chunk of swamp as our backyard, but the patch of dirt that is usable is utilized well!