1.) They're hard to find and pretty expensive. $30 for one isn't too bad.
2.) You can still play some Phantasy Star Online on an unofficial server with one.
3.) If you were to get the original Phantasy Star Online, then you could use that exploit and boot homebrew on your Cube.
4.) If you can run homebrew, you can run GCLinux and browse the web with it.
5.) I believe there's some method of playing Super Smash Bros. Melee online.
Those are some decent reasons.
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