As a broker myself, the above is unethical
IMO. I personally would never dream on doing the above.
Repeat business is far more important
Let me explain ...
If a buyer reached out to me with a budget of $30k and I end up getting the seller at $10k, I will simply work everything out and get back to the buyer with total price of $11,675,50 ( Domain, my commission plus escrow fees ) and close this deal via Escrow.com. I wouldn't ask anyone to put money direct into my business account for a brokerage deal, and also wouldn't recommended anyone else either. (
Unless someone is buying my own name, then yeah pay me and I transfer name, no need for escrow )
This is more ethical and again IMO everyone walks away happy with the deal, with the above
@AGAME said, imagine if sale price goes public on Dnjournal, someone will be pissed & puts a bad vibe in the domain industry.
With what I'm saying the buyer will save around $18k and seller got asking price, and trust me, next time buyer or someone they know is looking for Domain names, you be the first on the contact list.