Something I cant explain is how is it even possible that clubs are overcrowded from males with very few females, same thing with dating apps in the 20-30 age range.
Nightclubs are a predatory business model that preys on men's desperation (similar to dating websites). Most nightclubs will let women in free of charge because they know that more women brings in more men, and men will spend money because guys fall victim to the drink hustle:
Female: "Will you buy me a drink?"
Male: "Sure"
Female: "Thanks for the drink" .....and then she walks off.
Women repeat this game over and over, groups of women make a game of how many drinks they can hustle from thirsty men in a night, it's how they get their validation fix.
As for entrance fees, if a mixed group of male and female friends approach the club, the club will charge every head an entrance fee because they know the guys will pay for their girls.
But if it's a group of only females approaching the club, they can enter free of charge.
Summary: In the nightclub scene, women serve as bait to hustle money from thirty dudes - "bait" might not be the best term though, because women are willing participants in this game.
EDIT::: Also, the reason why these days men greatly outnumber women in nightclubs (moreso than in the past) is because women don't need to go out anymore to get their validation fix, they can get it by posting on Instagram.