Batman always has a plan and it always works

It's how he makes more money

Maybe he made them a deal play my party and you can make a music video in my garage.

It’s part of his cover as billionaire playboy Bruce Wayne. It would look suspicious if he didn’t didn’t hang out with musicians. So he’s not actually “renting it out” as much as he’s loaning it to his “friends” after they sit around shooting the sh$t and one is like “I have to go to stinking Burbank tomorrow and do this shoot..” and Bruce is all “No, no, no. You’ll miss My party.” And they’re like: “sorry mate. I don’t want to, but I’m only Aerosmith rich, not Bruce Wayne rich, still gotta work..” so Bruce insists he send his private jet to fly the production crew out. They can shoot in his garage and stay in the guest wing. And they’re all invited to his party. Boom. Cover story. Then when he vanishes mid party because he’s out batmaning- they just assume that guy in the suit going into the private spa with the 7 models was him. The next day he wakes up at 3pm looking tired and covered in marks- and another Bruce Wayne party legend is born.