I agree with you, Certlerant.
As an investor, I would stay away from this sort of trade, especially if I am the buyer.
Unless the broker can give you a very good explanation of why you should buy this stock from another client instead of on the market, this should raise red flags.
Never be afraid to ask you broker questions and/or to refuse transactions that he or she suggests.
Never just assume that brokers know best because trading is their job - they are in it to make money. It is up the client to make sure the broker is acting in his or her best interest.