[SJackson]

Whether or not her refusal to work on Saturday constitutes some sort of breach of contract seems to have been settled by the judge, it doesn't. The article notes

Seinfeld’s estate manager had visited the apartment with Cohen in January 2005, when the listing broker for the townhouse agreed to co-broke the house with her.

so the issue of coverage seems to be a non-issue. Seinfeld paid the listing broker, per other article.

It's not stated, but the article's implication is that Seinfeld employed a buy side broker. If that's the case, her responsibity likely entailed researching suitable properties for Seinfeld, rather than showing him properties as the listing brokers agent. She located the property and showed it to him twice.

He apparently purchased the property "without" a broker, though ended up paying the listing agent. That would have been a tough one, that scam has been well litigated. I think he simply saw a way to save 100 grand. If other articles are correct that Seinfeld and not the seller, paid the listing broker that would support the idea that he was simply trying to save a few bucks.

[Gay State Conservative]

As I suggested earlier,my experience with real estate transactions has taught me that laws and customs can vary from state to state...and region to region.The handful of purchases I've made recently have all involved both a "seller's agent" and a "buyer's agent" and they all involved contracts that stipulated that the seller would pay a particular percentage of the purchase price to the seller's agent as commission and that that agent would compensate the buyer's agent per a formula worked out between the agents.

It looks like NY might do things differently.