Assuming it's a skill based game but you never make an attempt to get better - I see the similarities. My question is: how is that different then a sport with leagues putting players at similar skill levels - is that just gambling too since they are so close in skill the game could go either way?

Many modern games have a ladder or elo system that you can only improve though increasing your ability to win (i.e. NOT just playing). I'd argue there is at least some value in taking enjoyment from improving yourself at any task. With that said if you are stuck at the 50% winloss playing over and over again you are probably trending to gambling addiction.