That is true, but you know what I always find confusing?
In 1999, at a cost of $84M, New Orleans build what seems to have been the last reasonably-priced arena in the NBA, seating 18,000. Since then, they seem to have jumped to $350M, then $500M. Construction costs haven't gone up THAT much!
Why is it that, say, Univ. of South Carolina can build Colonial Center, which seats 18,000, for $64M, or Virginia can be starting a new arena for 15,000 at a cost of $75M, but every recent NBA venue seems to have to cost 7-10 times as much? Sure, we want it to be nice, but can't it be an Acura instead of a Lamborghini?
Sometimes I just get the impression that, when it comes to professional sports arenas, folks aren't always treating other peoples' money like they would their own. I don't know what combination of bad planning, greed or corruption might be involved, but it seems wrong. With one of the smallest markets in the NBA, and no significant corporate sponsors, the numbers I heard started out at $800M-$1B, and as those numbers went down the Maloofs started expressing doubt that the place would be adequate.
Why so expensive? Would an arena the size of Colonial Center or New Orleans Arena, but about twice as expensive -- say $150M -- be totally intolerable?