Whether the system needs fixing or not if your playing games up to level 20 you probably know enough about rpgs where you or the people can play with can make stuff up after that level and fix anything that bothers you with the system in general at lower levels.
I just used the srd with paizos stuff pathfinder and starfinder you can make characters and see if you like the system with just that so you can't really complain about getting ripped off with what is out there for you for free from paizo.
The only things I really kept was the EAC and KAC and the skills list from starfinder. I find the less descriptive skills is more fun and a bit more realistic for the game I am playing and the disguise seems out there for this skill set but is really fun. Everything else I plug and played pathfinder rules and my own rule set.
As far as book quality goes the books are meant to be used.A book you got use out of even if it get's torn up in the process is worth more than any collector price down the road any day. The paper and the ink they have to use on these types of books is expensive. So if you like the universe it's defiantly not a rip off to buy the books.
The books and the pdfs can help at least help to be inspired in your game. No matter what your experience is you can go to a book store pick these books up and look through them and it will help you find an rpg you like that you can buy or help you create your own games.
I personally have looked at so many different systems I peruse them and come up with a lot of my own stuff and use the worlds and rules sets just as part of something larger I create.
The problem with that is if your not fair or trying to be decent with your fellow players it's going to be a bad experience and put you off rpgs which I hope it wouldn't. Plus a well nit already made rule set can help you learn to be fair and how to handle situations when creating your own stuff.