If we don't get it rented out soon doing that then we advertise it on the MLS and we offer $500 commission for the realtor fee when a realtor brings us the buyer.

Speaking from experience, they make life easier, they take care of all the hassles, and they usually get first months rent as their commission.

Brokers are incentivised by a commission earned at closing. 

That’s one of the main thing I always strive for because keeping a good lasting relationship with my buyers is worth more to me than a quick commission fee for a bad deal.

How are commissions on commercial sales determined, does the Seller or Buyer or a combination of them pay commissions or is it just part of the offer negotiations?

Selling through traditional means could mean a 3-4% commission on sales price and that would seem like a lot on a flip property that might already have a average margin.

It can be a helpful tool as it allows you MLS access and you can write your own offers etc .Are you looking to work as an agent helping people buy and sell and earn commissions  or to use the license to help you invest in real estate ? 

I do know that it is 100% commission based.

As soon as your go to 1.5x or 2x that type of property, it takes longer to sell and the sales commissions take a bigger portion of your profit on each deal.  

And each buyer in turn will spend way more than necessary on due diligence until a sucker who doesn't perform due diligence comes along and buys this property worth way less than it appears.I'm wondering if the Real Estate Commissions in the involved states (NJ for the property, CA for the auction company) allow this kind of non-disclosure?