But most of us find child abuse images to be morally abhorrent and so have no use for this stuff.
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There are dozens of exchanges out there where Bitcoins and other cryptocurrencies are traded in the same fashion as traditional forex. The only argument within this scenario, morally-speaking, is whether or not aspects of insider trading should be allowed. Rather moot, however, considering there is nothing at the moment that can be done about it.
http://www.mtgox.comhttp://www.btc-e.comhttp://www.vircurex.comhttp://www.cryptsy.comand so forth