Well, yes
The Pratts sold the rights to Cluedo for £5,000 in 1953, before the global success of the game, but Anthony was always philosophical about his decision and the secure future that it ensured for his family.
£5k was a significant sum. My parents bought their first house a couple of years later than that for £3,000. That’s now worth (it’s in the village of Strete, near Dartmouth, and is on the coast directly with it’s own stairway down to a private beach – private in the sense that you can’t get there at anything but low tide without using that staircase) £1.5 m or so. Sometimes turns upon AirBnB. Yes, I know houses were relatively cheaper back then. But another way to put it, £5k was three or four years middle class income. And 50 years what they paid National Service squaddies at the time.
Sure, sure, Cluedo became a massive hit. But £5k wasn’t nothing.