None of them cost 30k iirc, they only cost up to 10k or under (last I checked)
It's just a larger goal to aim for and save up for. It's not made for everybody to afford. Just like the 10k hats, getting capes, and being top of the leaderboard for anything, they're meant to be worked for.
It's meant completely for people to say 'woh, he has a golden fist. I want that' and no other reason. It's single and only purpose is to look cool and for people to envy the person that has it.