Numbeo

I think this website can be dangerous to people who want to move to a new state, a new country or a new city. They may think the figures of numbeo are correct and they may discover that it is not.
So, numbeo mentions that we should not blindly follow their figures. But if this website is not accurate, what should it be used for?

I think people don't need such a website because there are many websites that offer you real prices of things like online supermarkets, gas price, utility price...

It takes more time to find this information but it is more accurate to find real prices on the internet than average prices.
If you want to know how much it costs somewhere, you can also find a blog where people tell their life story about their expenses. I found that even a blog that is 5 years old is more accurate than numbeo