Once you get to know how bookmakers make sure they always make profit, your gambling experience can be phenomenal. Some matches are over priced or over priced ( more odds offered for a winning team).
What things have you noticed with Bookmakers that they do not want punters to know?
What you mean to say is some time you can guess it but some time bookmakers are also get loss as some matches they itself cannot tell who will win
That's not the point of the question, I think. Sure, bookmarkers can get a loss but normally they should always make a profit in the long term.
It's just a matter of consistently making the right calls according to your correct assessments, due to variance and unforseen circumstances, you'd make a loss from time to time, but overall you don't.