After watching the video more closely, I see some more variations. They provided a drummer to beat along to the DJ which is pretty cool. That's gotta be worth another $300. They also have up lighting through out the room. ...Honestly, that COULD be thrown in to seal the deal, or added pretty inexpensively. However, it appears he had it all DMX linked and strobing to the music. Is that worth a ton more money? Probably not for most, but the wealthy clients are willing to pay for it. Totems with Moving Heads...Ehhh...I've seen it so often that it doesn't impress me any more. However, to kids who have never seen those effects it might be real cool. I could put a couple of ADJ pocket spots on the edge of my table in addition to the other light effects I typically bring, and just leave them sound active, and the resulting effect would be pretty similar.
To be honest, the moving heads mostly point up at the ceiling anyway...If they are positioned lower to the ground, on a table or table height, the beam would be seen more, and the effect actually looks better. Moving heads mounted high up should be top mounted, and pointing down at the dance floor, not standing up...just my opinion.
Overall, I think it's more about finding that client with a lot of money to spend on an "over the top event"
The end result from having an experienced DJ show up by themselves with a nice lighting display and facilitate the mitzvah will yield just as happy of a client. With all the dancers I've ever worked with, I've seen little positive need for the actual dancers. They make my job a bit easier, that's about it. Needing a set up crew is only valid when mounting multiple flat screen TVs, and setting up Totem Truss, and lighting. Outside of that, a single DJ or a DJ with an "assistant/roadie is plenty to handle a typical mitzvah. Now if we are talking a HUGE mitzvah with 200+ kids then yeah I would want at least an assistant with me to help manage all the kids.