I never really looked but I just realized that you don't have gamecube iso's considering they only take up a bit more space than psx isos and the dolphin emulator is showing promise with its 64-bit version which can run at over 200 fps on good computers...
I just made a DVD with 3 GC iso's and they were around 1.4 GB a piece. I wish there was GC ISO's here. They are hard to find.
that's because it's hard to rip the images! remember the dreamcast?! to rip the image of a dreamcast game you had to up stream it from the dreamcast to the pc by using the programmers cable or the broadband cable. once that's done you have to rewrite the raw image into a useable image where it can be placed onto a dvdr. is that the final step?! i don't know because the process is too tedious to rip a gamecube image and stopped reading the faq.
size is a problem, even with UHARC compression (good luck finding something better than that) they're very big. Assuming UHARC manages to halve the size, that is still ~700MB per game.