"We want to make sure people notice with all the other promotions we doing that we're ready to make some deals happen, and the car just one way of showing that we're a cut above of what's going on in new housing market in Marina," Smith said.

Las Vegas builder American West is offering agents a $15,000 bonus to sell homes in its Glen Eagles development, provided they come in with a full-price offer within 30 days. The bonus drops to $10,000 for negotiated offers and those that take longer. "The goal is to try to push them to make a full-price offer," says Jeff Canarelli, vice president of sales at the builder. It is up to the broker to decide whether to give the bonus back to the buyer, he says.

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The best defense for buyers may be to insist that agents disclose the compensation being offered on any property under serious consideration. That way, consumers could negotiate ways to share anything that goes beyond a normal pay day for the agent -- or at least take the incentives into account in assessing the agent's advice. But few consumers raise such questions. Daniel Ruben Odio-Paez, a broker in the Washington, D.C., area who operates a real-estate search site, www.tbhse.com, says he believes "most buyers have no clue how their agent is being compensated."

The National Association of Realtors, the dominant trade group for real-estate agents, doesn't require its members to tell buyers in advance of a purchase how much the agents will be compensated. Federal rules require bonuses and sales commissions to be disclosed on the HUD-1 settlement statement, but buyers don't see that document until the closing or shortly before. At that point, it would be awkward to start negotiating with an agent about the compensation. The federal rules, enforced by the Department of Housing and Urban Development, or HUD, don't require agents to disclose trips or other noncash awards.