Maybe it's private?? As far as I know CoinBase is a small operation in itself (I mean the guy personally brings the keys to a safety deposit box versus a centrally owned vault of any sort) as well and wouldn't be surprised if they were masked with who.is protection as well.
In all honesty I've been trading with Cryptsy more lately than ever because BTC-E supports very few currencies, however I don't feel that who.is protection is any cause to call a company illegitimate
