Yes, so zero profit for company. So why is the mining company investing resources,time,people,focus on something like this, if we don't have competitive hashing chips ... i really don't get it.
...
There is a listing fee. Make it 30
BTC like at MPex, or more since that's the only fee. Scammer friendly exchange.

You must be joking. 30 BTC is well over $10k these days.
MPex charges 30
BTC for trading accounts, why not make it so for listings too? (Or 100, or 1000
BTC? It's a one time fee on an "unseizable" exchange.)
mpex.co/faq.html
"...I will be required to pay 30 BTC as fees for registering this account..."
mpex is a failure of an exchange and anyone who uses it deserves to lose at least 30btc..
And I don't think FC ever said
they would be
developing any decentralized exchange but that the exchange (either colored coins or mastercoin) was out of alpha and they would consider moving the entire DB to the blockchain. I could be wrong and they might actually be developing a decentralized exchange of their own which would be a waste of time but I doubt this is the case.