There are several theories from folks who participate in lottery but it has nothing to do with the likelihood of winning. So the chances of winning a lottery is nearly impossible that it’s almost not worth trying, but eventually it will hit a combination that someone choses. Both repeated number and choosing a different number have equal chances odds. The only way you can increase the odds of winning is to buy more tickets.
Buying more tickets and having different number combination increases someone's chance of winning. But that can cost them more money and as you've said, it's not worth trying to have more of it.
And lottery bettors that have been on it, they're for sure going to take care of their combinations and they know that someday will come to them and that day is about their winning the jackpot.
They will only fee bad when the time comes that their combination has won and they've become lazy on betting for that day of the draw and misses that.