I have tried it before and I lost. I won't try it again. What actually happened was I just saw a tipster thread and based on the previous prediction that the person has suggested which happen to be correct, I just went in when it was obvious I haven't heard about the teams playing before. I lost woefully and since then I won't put my money in such again.
don't get me wrong mate but its funny because this also happen to me, i was watching a tipsters thread here and i seen that he have good winning percentages, i did try one of his tips regarding to soccer where i really don't have any idea he had 3 straight wins from previous tips but shit happen to me because i got in the timing where the tips got loss, hahaha, so after that before i followed any tips i also did some research to know why the tipster gave his opinion about the games.
You are just not lucky on that particular bet or its totally a fake tips since anyone could always claim that they have good sports tipping but before following on these things better to research first if this people is reputable on giving tips and if you lose then take it since its gambling after all we should not expect always winning games.