Tunneling not needed to play GC LAN games online??

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This doesn't make sense. How do you find anyone to play with? The deal with the GameSpy software was that it would be used to find people to play with, but you aren't going through a computer. I guess if the game is set up to do this for you and it searches teh GameSpy servers or whatever. But it seems far too easy. Why would anyone spend hundreds of thousands of dollars setting up a big network if it was this easy? And if all this is running through GameSpy, what do they get out of this? Maybe Nintendo is paying them, in which case there must be a fee to use the software. But then aren't we back to the online gaming thing Nintendo said they won't do? I don't know too much about how all this works technically, but something doesn't seem to add up.