As much (or as little) as you agree with each real estate business with whom you do business.
When you invite a real estate business to Multi-List you can suggest a financial arrangement based on 'actual resulting business' or on a 'per referral' basis. No two arrangements need be the same. You might agree with one a 50% share of his fee should one of your referrals result in the purchase of one of his properties; and you might agree to pay another 20% of your fee should one of his referrals buy one of your properties.
The same goes for Rentals.
Whatever arrangements you agree with other real estate businesses are entirely up to you. PropertyWorld.com leaves it to the indivual businesses to agree terms - typically a share of the fee when one of you introduces a buyer or tenant to the other. PropertyWorld.com takes no share of these fees/commissions.
Naturally there is an element of trust involved but, as you receive copies of all referrals, you can keep an eye on what is happening. If it's not working out with a particular relationship you can always cancel the deal without penalty.
