Buying real estate is one of the biggest financial transactions most people will ever make. It is expensive and sometimes a bit stressful. While it is also, hopefully, a pleasant and successful experience, I try to add to the joy by giving you a thank you 'reward'. Many Realtors give 'Thank You' gifts at closing such as a bottle of wine or fruit basket. I give a Rebate check of 20% of my share of the commission, based on a coop commission being offered of up to 2.5%.
As an example, if my share of the coop commission is 2.5% and the purchase price is $300,000 then the math looks like this.......

$300,000 x .025= $7,500 (My share of the commission)

$7,500 x .20= $1,500 to you at closing. When I get paid, you get paid!

Many transactions have somewhat different commission splits.

If the coop commission being offered is only 2% then you get 20% of $6,000 or $1,200.

If the coop commission being offered is more than 2.5%, your share is based on 2.5% (maximum I am offering) of the sale price or $7,500 in this example, so you get:
 .20 x $7,500 or $1,500.