Yes, for once I agree with #1 on the list... to borrow the Hulk's catchphrase, "Scrooge richest one there is." ;-)
Past Scrooge, I'd have placed the Rich family (not Richie himself---it's his parents' wealth he's using; his $100,000 a week allowance = $5.2 million a year... Miley Cyrus probably made more than that from Hanna Montana ;-) ) a notch below whatever McDuck's worth.
Ignoring the bizarre or limited-imagination-choices on the list (the *remake* of Arthur without a word about Dudley Moore?!), I'd have also placed Hiram Lodge, Veronica's father from "Archie" comics, on the list, being a billionaire (in modern books)...