In a state where parents drop $100K on a Bar Mitzvah like it's nothing, Marcello's take has to be more than $1k-$2k. Take a look at everything you see in that video - the lights, music, percussionist, etc... all subcontracted. Marcello (the guy they hired to put the entertainment together) is emceeing the event... and if you've ever met him or seen him work, you know that he's worth every dollar he asks for and more, but the overhead costs aren't his to bear and insurance is cheap.
The drummer charges at least $600 to show up. He's easily a $1200 upsell.
It's an outstanding business model. Those top 2% people brag about how much they spent, and in the Mitzvah circuit, parents always want to make their kid's party better than every other party they've been to. If you find 20-30 Mitzvahs that are able to put at least 5k in your pocket and likely much more, it's possible to spend your winter in the Caribbean,