Who even cares,

I and many others.

most of these parties are for adults also.

And there are adults complaining.

It's a part of the girls job also, it's not like they companies are forcing them at their will.

People do what they have to to pay the bills.

Have you ever been to a traditional sport after party? Like nba or NFL.

Neither of those are big in the UK. And what do you mean by traditional after party? If you mean like watching with friends and celebrating then no, we don't hire dancers.

I guess we better not have cosplay conventions anymore because people are immature and sensitive about everything also.

Straw man. Conventions are different. People are showing off their art there, both genders do it and people can wear what they want to. This has nothing to do with immaturity, ignoring this problem and blaming sensitivity, sjws and pc culture instead of actually discussing it is immature.

Gaming is already taken serious,

No it isn't. Game dev is famously hostile to women. I didn't follow gamergate but the attitudes some men were showing during the hype were absolutely vile.

if not there wouldn't be billions pumped into it every year.

Money has nothing to do with it being taken seriously. The Chinese super league and MLS buy football players for exorbitant amounts for example, but no one takes them seriously in football. They're known as retirement leagues.

Not would we have people like Shaq, A rod, or Mark Cuban investing in exports.

Idk how this is relevant or what it means.