I have seen it losing more than 5 times in row, besides that, opinion considering tipster is personal and I disagree. For me reasoning is simple and quite obvious:
1) I know everything about Spain primera and I really rock it, its around 40 matches per month of which usually 10% are good matches with value. That means if I just stick to my knowledge, i can have small profit.
2) If you think you can cover superbly more than few leagues, you are wrong. You can check forums( usually 2nd hand info, odds already dropped and value lost) but still it is hard to keep focus on wide area. I have tried by myself, it didnt work. Perhaps you can make it work, but I seriously doubt it beacuse in all this period I haven't found a bettor who doesnt use some paid service, either for picks either for informations and analysis.