Many years ago, Mr Ricketts & I used my mum’s family railcard, having cottoned onto that one adult could travel at half price and 4 kids could travel for £1 each. We ran a “trip” to Plymouth for 3 others who got on as kids and charged them about £15 each, which was still way less than it would have cost them by coach or train as individuals.
The £45 we took paid our trip, lunch, and admission to Home Park!