They got very good payouts because we had a bunch of lucky blocks in a row.

But that's only due to luck. And you can't predict future luck. So yes, gambling is the right word. But there are no stats or anything at all to improve your gambling odds.

Some people do believe that if you are lucky today then you will be lucky tomorrow as well. Other people believe that if you are lucky today then you have to be unlucky tomorrow because it has to even out. It makes no sense at all. But I guess people have their superstitions.