[atheriel]

This is attractive in theory but it's a bit difficult to do in practice. Usually the places with the worst comparative odds are also quite aggressive in banning sharp accounts (including any proxy accounts you'd set up as this rival sportsbook). You've got to take the vig into account, as well, which is likely high. So in most cases it's probably not be worth the cost. Especially when there are plenty of other ways to use sharp information to make money.