Regarding insider information in sports betting - yup, no rules against it. The professional gamblers who make a living betting share this kind of information,

Regarding insider information in sports betting - yup, no rules against it. The professional gamblers who make a living betting share this kind of information, there are secondary markets that distribute such information (for a cost) etc..... These types of bettors, who generally win are interesting - thier actions cause bookies to change their offerrings immediately. They are on watch lists at various bookies. Bookies look for patterns of syndicate betting (where one guy who's known to be a pro gets a bunch of others to get a bunch of bets in as fast as they can before the bookies move the lines - and the bookies are all watching each other, both in vegas and around the world). Guys known to be pros also end up sometimes with different odds offered to them, with lower limits than the average person as to how much they can bet, etc.