Because he makes his team better. Much, much, much better. Like, day and night better.
I'd cool it with the "much, much, much better" since they've never sniffed the playoffs or won even 30 games with Cousins, now in his 6th year. Yes, the teams around him haven't been good either so he's not entirely to blame, but it makes it hard to argue that he makes those team better at all if he's never won 30 games.
No, I won't.
Because I have already provided cold, hard objective facts to prove how "much, much, much" better the team is with Cousins on it.
You're talking about a bad lottery team without Cousins, versus a potential playoff team with him. That is a MASSIVE different for just one man to make for a team.
Look at the Celtics for example. Everybody talks about how important Smart is to this team, but look at our win record this year when he has played, versus when he hasn't. They are pretty much identical records. Teams have a tendancy to make up for it when a key guy is out by stepping things up. When Cousins is out the Kings still have a pretty solid talent set - Rondo, McLemore, Rudy Gay, Kufos, WCS, etc. That's definately not a 'Philadelphia-76ers-bad" roster.
Yet without Cousins this year, the Kings are 1-7 (0.140) which is on target for the second worst win percentage in the NBA (only the Sixers, at 0.050, are worse).
The fact that the team has solid talent (arguably more than ours does) without Cousins and yet is on target to be a bottom 2 team tells you how many other issues there are on that team affecting their wins. That could be coaching, it could be team morale, it could be poor management/organisation. Whatever it is, the team is a ducks breakfast of a mess, and the fact that that pig of a team is actually playoff caliber when Cousins plays is nothing short of a revelation.
Yet if you stop and look at last year's Sacramento team, you'll find the same is pretty much true. When Cousins played, they were at (or near) a playoff win percentage - when he was out they were a bottom shelf lottery team.
So no, i'm not going to cool it, because Cousins is a beast...and he's a beast who adds an astronomical number of wins to his team. He is absolutely a franchise caliber player in terms of his team impact, and there is no debate about it.
Anybody who tries to claim otherwise is just a biased hater - there is no other way to put it.