For luck based games, it could be true but for sports betting I think you can win more than your loss.
In sports betting yeah it's different you can analyze and have your strategy on what to bet.
For some gamblers it's possible for them to have more wins but for me, it's difficult.
Sports betting is actually a different ball game compared to every other form of gambling which I believe really that with some good analysis sometimes and knowing how to manage the risk as well as your funds, you can be successful at it.
I am saying this not because I am a sport better, but I have seen people analyzing matches before and even though sometimes it is centered on luck as things may not work as planned, but most of the time, things get to turn out the way they analyze it and I can imagine how people in that category would be fairing over time when it comes to sport betting.