How is the gateway not a party?
It is, the issuer is a gateway.
In fact, how is the gateway not in fact a party which is completely equivalent to the bank?
It is, except that it's not the gateway keeping the books, but the impartial and reliable P2P network of Ripple validators.
In Ripple, as I understand it, you deposit funds at the gateway and sign an instruction to the gateway saying to pay those funds to the order of the payee. The payee can then redeem those funds at the gateway, or can sign the instrument over to yet another party. Eventually one of the holders redeems the funds by presenting the instrument.
The signing over happens inside the Ripple network, under the supervision of the validator nodes. The gateway only deals with issuing and redeeming IOUs.
And I'm not sure I see the incentive. To be a gateway, it seems you'd have to be regulated as either a bank or a non-bank financial institution (like Paypal). At that point, once you've gone through that trouble, you might as well just connect to ACH and SEPA and the other various clearing systems already in place.
You would connect to those for sure, because that's what allows you to serve as a gateway into the Ripple system, including its distributed order book for currency exchange.
Well there you go.
Conversely, Bitcoin doesn't add anything above and beyond Ripple, except for greater current mindshare.
What exactly does Ripple offer there?
A distributed order book, plus the ability to pay in any currency with any currency. Say you want to buy BTC with EUR and the seller wants to sell BTC for USD, then the system automatically matches the orders if the price matches.
Yeah, if someone who accepts ripple payments allows me to exchange USD for Bitcoin, and I trust them, then I can buy and sell bitcoin with USD through Ripple.
Also if you both trust the same gateway, or if there is another connecting path between the two of you in the Ripple trust graph.
If someone who accepts ACH transfers allows me to exchange USD for Bitcoin, and I trust them, then I can buy and sell bitcoin with USD through ACH.
The latter already exists (Coinbase). I don't know about the former.
The distributed order book is the biggie for me.