Building sites for earning

I'm trying to dig a topic to create my website, but all topics, which i love, have filled enough.
What's reason to create 101 website?
Folks, what are you looking for if you gonna build a new website?
Let's starting from me.
1. What i can say for that topic and if that one is interesting for me.
2. How many sites already dedicated to that topic.
3. How I'll earn from my site.
4. How often i'll have to update my site.
Please, share with me, if you look on other factors.

 

All questions will be answered if you focus only on max of 5 sites during start-up..

 

Thanks.

Hope somebody will else post here too.

 

Create just one site: there is always alot of keywords to be optimized, content to be written, links to be placed, etc etc

 

Can i earn from an anime streaming sites? i was thinking on building 1 and wonder if adsense will permit this kind of sites to earn online.

 

I think you just create one main website, keep posting on it and see what is the readers trend, then you may set up another websites to support you main website. Another website at least could help you to create traffics by catching another readers. Millions of readers, millions what they need or want to read.