Buying tips from tipsters is an unwanted expense because they do the prediction similar to the way we do with collective data.
It really depends on the tipster. If that “trusted tipster” the OP mentioned consistently gives winning tips, then maybe it’s worth a shot.
But at the end of the day, it’s all about how much risk we’re willing to take. Honestly though, relying on paid tips isn’t the best idea especially if you have bigger goals in sports betting or want to take it to the next level. If that’s the case you can’t rely on other people. You need to develop your own skills and judgment.