I needed 50 ip to unlock a champion

It's fair in that you're a part of a larger community and on average, it should be more than enough. "Fair" doesn't mean everybody gets exactly what they want.

Also, let's take a look at this for a second. 17 games. Now the average game right now is higher than this, but for argument's sake we're going to average game length at 20 minutes. That's still more than 5 and a half hours of league per day if you're playing that many or more every day (but really more bc we rounded way down, remember?). Don't get me wrong, I can definitely get down on a video game for several hours like the best of them, but this isn't a healthy habit if it's not just occasional. Sedentary lifestyles have been linked to health problems and shorter lifespans. On top of that, gamers have been known to literally DIE - if not fall seriously ill - after spending several consecutive hours playing. Riot would be remiss to cater to/encourage gamers to spend the equivalent of a full work day on their game every day.

By playing 17+ games per day compared to a more average 4 games per day, you're getting probably more than twice as much BE/day than the typical player on average. If riot considered your experience more typical, BE costs would be somewhat more, but they don't mind giving you an advantage since you are putting in the time.