Yes, taxi might be a valid offer, but I wouldn't be the second bidder in any auciton that has only one bid for that amount of money, especially on a .us. Let's face it, $35,000 is not the norm for a .us domain.
On a related note, I would love to see taxi.us go for $35 grand. In the meantime, however, I am still going to apply the "giggle test" when I see such posts.