Adressing the original topic of the post (not the others that followed!?) - I've met some really good friends during my time in Doha, many who have left but I keep in touch with regularly, and many who I will keep in touch with when I leave.

If you have the attitude that there's no point making friends cos we all move on, then perhaps that will hold you back from making friends.

And the plus side of becoming friends with ex-pats is that they all move away to different countries, so you can have lots of holidays with free accommodation and tour guides!