I hate this system as well, but are you absolutely sure it’s only 10-20%? Many of my colleagues who switch jobs often (who are all mediocre at best) make twice as me and I already make happy money.
Money isn’t everything, for sure, so if you’re happy here stay here. But let’s not blow things out of proportion. Ranting about an exercise that involves only your brain for 30 minutes that could turn to hundreds of thousands of dollars to gain, sounds like a kid ranting about exams. Do you know other jobs involve physical labor? Have you seen cheerleader tryouts? No one owes anyone any luxury. If a company decides for any stupid reason that they want to keep a hard interview then it’s their prerogative.