There's a lot of recreational gamblers out there who have no interest in trying hard or spending time learning to play well. They just gamble for the fun of it. Putting effort in would likely ruin their fun.
Just look at any casino at the tables full of people playing the table games (especially
baccarat). They are getting eaten up by the house edge, but they don't care, they just keep playing.
Consider the 2nd graph. This player has lost about $28,000 over about 4500 games played. That's only about -$6 per game played. If he's playing $20+2 buyin games, that's a -27% ROI. Pretty bad, but for some that's cheap entertainment. He has likely been playing years and years to accumulate that many games played.
And with 30% rakeback/bonuses, he may indeed not be down nearly that much. Even if he's playing $10+1 games with an ROI of -55% (absolutely terrible, probably the worst <2% of all players), he's still only losing a few bucks per game played. Figuring the average tourny (for him at least) at an hour, that's pretty cheap entertainment.