$20 only Perth are tipped to finish lower than us paying $25
Just to be pedantic, Perth are NOT tipped to finish lower than us... it is just the odds to WIN the league. Which is an all or nothing thing, you wither win it, or you don't win it. Perth are at longer odds to win the league, but that does not mean there are any odds being offered on them finishing below (or above) us. Nor is it that they are even favourites to finish bottom (although they might be, but that would be a different set of odds).
In other words, the differing odds to win the league are not the same thing as a prediction of the final league standings / the order the teams will finish in.