Oh man...I sold my entire Gamecube setup for like $200 on here. Dumb, since I'd probably still play it regularly these days, and I don't think I bought anything worthwhile with the money. Honestly, I feel like the Gamecube was the last system I really enjoyed (I had fun playing systems later, but it was the last one that I feel really nostalgic about).
I don't even want to think about what it'd be worth if I'd kept it and sold it at more optimum time. I had the component cables, several games (Wind Waker with the OoT Master Quest disc, think maybe some other somewhat rare-ish games like Ikaruga, think I might've had a special edition of Metroid Prime 2).
Oh, had the Game Boy Player (or Game Boy Advance Player?) for it too (I think I played Metroid Fusion on it mostly).
I have a weird fondness for the Dreamcast as well, although I didn't actually enjoy it that much (I'm not really into the Arcade style games, and fighting games do very little for me outside of Smash Bros, although I had fun playing 4 player Dead or Alive 3 on the original Xbox; I like Sonic Adventure and Shenmue ok, but think I played Tokyo Extreme Racer and Record of Lodoss War more than any other games on it; maybe not as we played through House of the Dead 2 a bunch). Ended up giving that to my older brother when I got a PS2.
Oh, I had Skies of Arcadia Legends too. And Phantasy Star Online Ver I&II (talking about for the Gamecube, but thinking about the DC reminded me).
Not sure how good this site is for valuations, but man...
https://www.racketboy.com/retro/the-rarest-most-valuable-nintendo-gamecube-games
I actually still have my original Smash Bros (the black label version?)! Maybe I should look at selling it. Hmm, nevermind. Mine isn't the original (think I got another copy for dirt cheap from a used game store when I had a Wii). I bought my Gamecube when Smash Bros came out (so I know I had the original, I bought it for that game, bought it and 3 extra controllers to play multiplayer in December of 2001), but this one has a gold "Best Seller" icon on the front (its not the Player's Choice one). Er, ok, not sure what's up with that. So there were "K Mart" versions of some of the other games, and I bought it at K-Mart so maybe that's why? But I'm almost certain I bought it at launch (or near enough to it, that it shouldn't have had "Best Seller" on the sleeve (its not a sticker, its actually a different sleeve printing) already.