Personally never thought of paying someone to provide me tips on how to win in gambling or betting. When it comes to card games, I play safe and for fun.
There is no question of insider news in card games except the Poker game which is a PvP game and if you are betting on a tourney like a sports bet then again the insiders may help or bluff. 
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While for sports betting, I follow the sports I bet into and also ask my sporty friends for help in prediction. Never really thought of using consultancy services when it comes to gambling.
Come now, we all know what those so-called "consultancy" offices do. They pump a certain team and make their opposite side odds very big. They might have some inside info and are thus doing this but its paid manipulation and you cant do anything about it. Also there is no guarantee that what they picked is 100% correct. In the end you have to decide whom to bet or not so why pay someone else for picking it?