That's hardly a 1-to-1 comparison. For starters there are a number of large, legitimate businesses that make their money selling MtG cards on the secondary mark

That's hardly a 1-to-1 comparison. For starters there are a number of large, legitimate businesses that make their money selling MtG cards on the secondary market. Secondly, didn't the folks at mtgox just use the domain name because they already owned it? AFAIK, the mtgox exchange bitcoin didn't grow out of the mtg exchange, it just happened to share a domain name.