The bookies almost always win because 95% of the gamblers make rage bets or all-ins and lose in the end..only those with 100% patient can win. You can check my thread.
Just think that if tip seller can predict 100% accurate then why he/she will sell it to the public? If I was them then I will make money instead of giving tips to others but I will sell to others only when I'm not very sure about my pics. All tip sellers are doing good money by selling these tips but whoever buys these tips will be losing money. So don't depend on other people tips and bet only if you can analyse the game.
That would be a very big advantage and you're right I won't sell it to others instead I'm going to use it to make more profit. And I don't believe in a 100 percent prediction because there are so many things to consider before a match can win ( well some games are really controlled by rich people and we have no choice but to accept the decisions sometimes)
Well occasionally I'm playing sports bet but I'm not taking it to a serious way like buying some tips, make it fun and make it a bonding time with your family and friends. Betting with less pressure and laughing with those important people around you is better than taking it seriously but you can't sleep at night because you lose a match.