This should really be in the newbie forum but I have over 100 posts, so I apologise if this sounds like an amateur question.
If you're constantly btcl, you're expected to profit long term, right?
If you find a bookie that's always late with their lines, and you can beat the closing line this way though not by much, are you still expected to win long term?
Any "ifs and buts" to this would be appreciated because I know this sounds too simple.