Please understand that a liquidated damage clause is usual and customary, though only if it is binding all all parties (owner/seller, buyer, broker). In such event that the broker is a party, it is imperative that the broker (or his legal representative) execute and/or initial that clause that names him specifically.
If the LD clause does not include all parties equally, than (1) it should be 100% deleted or excluded, or (2) some other reference such as suggested below be inserted into the contract.
But, you cannot have it both ways. All are in, or all are not.
Suggested language:
It is understood and hereby agreed by the parties (owner/seller, buyer, broker, any other party that has or may have ownership status) that notwithstanding any reference in the agreement to the contrary, in the event of a failure to perform or complete the transaction by any party for any reason whatsoever, any deposit paid by the buyer is hereby unequivocally fully refundable forthwith to said buyer.
I'm just saying...