You are not looking at it from the libertarian Koch network standpoint.
SCOTUS justices sell the service of ruling in your favour, in a kind of freemium model.
Want a ruling based on the constitution bla bla bla, go with the free service model. Want the premium service model, with guaranteed outcomes, well, then you have to pay for it.
Calling it a bribe is so very last century, it's a premium service fee.