In their email they said they needed someone "immediately," which suggested to me that one of their teachers had suddenly quit on them.

I told them I could be there in a month because if you book a flight immediately, the fare is at least 100 USD more.

They never answered. Since their email did not address me personally I assume it was a scatter-gun mailing and someone else bit faster.

You are right about the photo on the website. The suits on the models don't look quite right, as if they were hastily supplied by an agency.

I don't mind someone not paying a lot for a website, etc., because it could just mean they save on overhead, which is good business strategy.