I addressed this above. There is no spam concern because there is no distributed block chain with data storage and bandwidth pressures.
There is spam concern because there are transactional limits to everything. If there is no spam prevention, anyone can attack the network with say 100,000 false transactions and grind the network to a halt or at least significantly slow the process of transactions.
I didn't say it did. I said it needs to be mathematically verifiable. Show me how it is and I'll shut up immediately.
I'll have to let one of the "math guys" deal with that. Maybe JoelKatz is around.
You mean only pay attention to the great sounding aspects like external, simple currency exchange, but not to what the "right hand" is doing behind the back with XRP...
Why do you care what's going on with XRP? How does that affect yours or anyones ability to utilize the network. If you don't like XRP, don't use it. Ripple is currency agnostic. For people that only want to deal in BTC payments from here till infinity, Ripple will likely have no benefit. For everyone else, there is tremendous value and when you start talking about hosted wallets, most people on the planet won't even know XRP exists. So I fail to see how any of this is relevant.