Generally, how many articles do you need to go autopilot?

Hello!

Everyday, when you seek information for something on a specific topic, you get to these blogs which are inactive, they have like 200 articles but there is never anything more on the page written, and they still rank in high (like 1-5 place in google) and these seem to earn a lot of money.

I have a blog of my own, I write articles on weight loss. I want to cover everything in that area to make it a site for a person who wants to lose weight and there is everything you need to know. But how many articles do you generally need to just one day just let it stay there and never do anything more so I can continue with another site and so on?

And also, I started the blog for like 5 days ago, and it seems like the days when I don't advertise the blog, I get like 12 unique visitors and the days I really try hard, I get like 120 unique visitors but that only lasts for one day. Should I just skip the analytics and just write whenever I feel like writing and don't care about the statistics and hopefully see it goes up in the end? Or how do you think I should do?

Also, when there comes a day you don't want your blog anymore, what can you generally charge to sell your website? The few people who have read the site says it is high quality, my articles are generally 800 words, I have currently five written, and I have a rare domain name, it was recently on an auction and the domain name itself came up to $2200, then the buyer withdraw because his company went bankrupt and by mistake the domain was released and I bought it.

I'm sorry if you didn't really understand what I meant, but I hope you did.

Thanks.