Golden State hasnt payed a LT the last 3 years man. A small market team could have done what they did. So far it has nothing to do with there market size. They drafted extremely well, found a great coach, and got lucky their transcendent super-star had some bad ankles and blew up after he signed a bargain contract. They did all that so well it attracted a super-star who was tired of playing in an isolation "my turn/your turn" system who happens to be one of the best scorers of all time. It's just a lot of freak occurrences that will probably never happen again. Enjoy it while it's here and dont cry about it too much. Golden State and Cleveland had been terrible franchises for decades, so you got your wish of seeing different teams at the top of the NBA pecking order.
Yeah but they did went and got Durant and Durant joined them because he knows GSW will be willing to pay the Luxury Tax going forward.
On the other hand OKC has had to trade away Harden because it didn't want to pay the Tax. Had that been a New York team with Durant, Westbrook and Harden, they would have kept them all and paid the Tax.