I am building new ones every week from the scratch, so it is definitely worth it if you put a lot of good work into it 🙂 If you do this on the side and devote like one to two hours for it, you can build a very nice income after some time.
You will need a hosting that is adult friendly and managed, provided that you do not want to manage your server yourself and fix all the stuff, you could spare some money, but it requires knowledge and time to do this.
To be honest, I have already answered all of your questions in my posts. Please take a look at these three:
Start Here
How To Start A Porn Site And Make Money In 2020 – The Definitive Guide
How To Promote Adult Webcam Site
But feel free to ask me anything specific that is not included there 🙂