Absolutely. His house was about built out though. With the pool taking up much of the footprint, I think the allowable percentage of buildable lot had probably been reached. His friends were probably already suitably impressed and now he needed to capture some bigger fish in the community. A country club membership would be just the ticket.
I do think SP's parents put up the money for the CC. He probably convinced them it would be beneficial to his job and his status in the community. It's easy to detect an attraction to appearances in the Jackie Peterson psyche. Hence all the stories that she has told of SP supposedly saintly youth. "The Bad Seed" movie flashes by everytime I hear one.