Polls v. Vegas

Last night's "National" "Championship" game between Oklahoma & Florida provided an example of a game in which those in charge of the rankings -- a blend of coaches, journalists, and computers -- thought that Oklahoma was going to win, as they were the #1 ranked team in the country, while those in charge of the books in Vegas thought #2 Florida would win, as they were favored by 5 points. In this case, Vegas was right.

It would interesting to know how often this difference of opinion occurs, and who tends to be right more often (I'd bet on Vegas). And if that is the case, shouldn't the ranking system as a means of determining who plays for the championship just be scrapped?