I own Skies of Arcadia Legends for the Gamecube. It's missing the manual, but I think it would still go for a fair bit even without it.

wow, didn't know that was worth a bit, have a complete copy of it, bit annoyed seeing the prices on ebay since I only took it out of it's plastic to play for about an hour, played the majority of that through on my Dreamcast copy of it.

I have blast corps and diddy kong racing

how much are they online ?

I have Jet force Gemini so that's rare.

I simply threaten to give it to people as a christmas or birthday gift .

The upside to all this is they pay me to keep it , but there is also a downside , my family no longer invite me to Birthdays or Christmas or even send  me presents

Disregard that last comment I realised that to is an upside due to the fact that I don't have to unwrap 12 pairs of socks every christmas and birthday .

I have Xenoblade (American), is that still worth like a hundred bucks or whatever? It's not sealed.

I suppose some of my older games might be worth anything. I've never really looked into it as I have no intention of selling any of them.

I notice nobody has mentioned Tales Of Symphoinia I know that was one of the rarer games on Gamecube via the online community (PAL version)

I remember that game having a higher value, but nowadays it's one of the cheapest GC RPGs, probably because of the PS3 collection that made it much easier to obtain.

I need Superman 64, my sock drawer is overflowing :)

I remember at one stage its value was comparable to Path of Radiance value.

That was last generation tho.