It tells you to enter the disk

Only asks me to do that if i want to start something that requires the disc otherwise i can browse the channel without the disc.
I really only used the channel to access the tournaments/challenges that Nintendo set up.
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The game has the option of installing the "Mario Kart Channel" that requires, depending on region and content, between 74 and 86 blocks to the Wii Menu, which presents the current regional and worldwide rankings, and the option of sending or downloading saved time trials (ghosts) using WiiConnect24. Mario Kart Channel also offers worldwide tournaments from Nintendo. The channel enables users to check if any members of their Friend roster are currently online, and to participate in a race or battle with them.
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Mario Kart Wii - Wikipedia, the free encyclopedia