I know it's apples and oranges, but having worked in Higher Ed the last decade, we fear having to base budgets on enrollment. We much rather have enough coming in via donations/grants/etc. I'd have to think pro sports teams are similar in that the "other" revenue means as much or more than attendance. If this is the case, a new stadium w/ more night games and advertising would be more valuable to the team than the possible slight drop off in attendance. The key is knowing when that drop off is more than the increased revenue from other areas. There's a lot of hearsay about what location changes would do to attendance, but I'm sure if any move was considered, they'd be using more than just random opinions.