Many teams just don't want to play the developmental game. If you're the Lakers and your brand is your name, do you want to spend time and resources drafting hoping to find elite players or would you just rather woo them as free agents and deliver a championship in a fraction of the time?
Places like Utah are never going to have that type of pull - you have to draft with success and build a winning culture and you can potentially woo some decent core pieces to surround the guys you've maxed out.
And every once in a while, you luck out in a smaller market like Duncan with SA or Giannis with MIL.