Why live in Qatar why emigrate to Qatar or stay for a long time?

Why should you live in Qatar as an expat, emigrant or working nomad?

Because there are many other expats and many expat activities are organized.
Because you broaden your horizons by learning about totally different customs and rules.
Because people speak English well and you don't have to know Arabic.
Because it is an incredibly safe country (apart from the strict laws).
Because the facilities are unparalleled.
Because, despite being in the desert, you can discover an awful lot of culture such as art, museums, movies, operas, etc.
Because you can learn about a political system without political parties.
Because there is no income tax.

That there are strict rules and punishments, for example for homosexuality.
That traffic can be quite chaotic.
That you read up on cultural norms and behavior. Some rules can be surprising.
That life can be relatively expensive, but at the same time you keep more salary because there is no income tax.
That summers are extremely hot.