Without rules, there can be no squares or circles.
When Twilight Mansion was established, Gonzalez City's wealthiest man, Ovidiu Cook, and other high-level individuals decided on a rule: Anyone who entered Twilight Mansion without a membership card would either have a leg broken or pay a fine of fifty million.
The broken leg was a rule set for those without money, not only to deter those trying to sneak in but also to ensure the exclusivity of Twilight Mansion's clientele.
It ensured that everyone who came here to dine was part of high society, sharing common topics and often striking unexpected business deals on the spot.
The heavy fine was for the wealthy, after all, being rich didn't guarantee access.
The very existence of Twilight Mansion also indirectly imparted a lesson to the people of Gonzalez City: even if you are wealthy, it's not very useful. If you don't integrate into this circle, you will always be an outsider.