VEGAS Promoters WTF do they even do?

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Hello All. What do promoters do and how does that whole scene work and such? I am planning a trip to Las Vegas for about 20 guys (my best friend wants a 'Day Club' Cabana for his bachelor party).

I see that on http://www.draislv.com/ Drais Beach Club website they have a Cabana for 20 people with a $5500 spend minimum. It readily displays the price with the ability to book it through the site and what is done is done.

THEN I hear all this shenanigans from people that I know and internet resources that I need a promoter to do it, that there are better deals, that etc. etc. etc. Then one promoter tells me it is upwards of $20,000 another says $4,500 the website says $5,500. Some promoters make it free. I am so confused. Halp. If I can book on the website, with the prices, why would one need a promoter?

TL;DR: Planning trip to Vegas. Need cabana at day club. Do I need to use prompter or book direct. WTF is a promoter what do they do.

(I know a promoter promotes.. looking for actual real life use like how do I use a promoter pros/cons how do they work and the like)

** bonus points if anyone on meh happens to be an amazing Vegas person and knows meh status deals for Vegas beach/day clubs.