The whole protfolio is probably in the low $xxx range. Washroom has the best value of the lot. Most of the others are closer to the value of the registration fee.
We have 2 mil results for 'washroom', but I see no adveritising for that term. So the question is, who wants to advertise washrooms? There are a few, advertising for other terms who might need to realize that washroom.us could help them sell more without advertising. If I could get a hold of those end users I would think that they would be willing to pay low to mid $xxx for the name. Obviously they would have to be based in the US to be eligible to buy. If you just tossed it up for auction somewhere it would be a harder sell and less likely draw a crowd, so more in the $xx range under those circumstances.