I'm not sure why everyone is blaming Capcom when they pretty much had no choice but to close down Clover. Clover was eating way too much money and Capcom wasn't getting anything in return. Capcom gave Clover assloads of money to develop games but eventually, with no money coming back in, they had to close Clover.
Capcom also had no choice but to close down Clover since the two main guys at Clover had already left.
As for Okami doing better on the GC, I really doubt it would. As somebody said earlier, Beyond Good and Evil was on the GC and it still flopped when the GC userbase is supposed to be the ones who would appreciate those games more.
As for Viewtiful Joe, sure it sold better on the GC than it did on the PS2, but the numbers themselves weren't that great. Viewtiful Joe sold just under 250k while on the PS2, just under 100k.
Its too bad a studio such as Clover didn't do well. They were definitely a studio that stood out from the rest.
Now only if people bought the unique games such as Okami and Beyond Good and Evil we wouldn't be seeing so many Maddens or Mario Partys.