You’re using the grounds of a tennis club without paying for it. Is it fair?

Your friend and you play tennis in a neighbouring suburb where only residents who pay a yearly fee of Rs 5,000 may use the courts.

Your friend and you play tennis in a neighbouring suburb where only residents who pay a yearly fee of Rs 5,000 may use the courts. The courts are unsupervised, and one or both of them are always vacant. You are not preventing any resident from playing. Are you committing an unethical act by using the courts?