At the end of the day, you will get what you get.
If you are basing a decision to move your family and life to Qatar on +\- $1000 my advice is don't do it.!!
The basic pay is clearly stated, the allowances are what they are, precisely that!
Some people spend all their housing allowance, others don't, and put money in the bank.
We've all seen guys who don't spend any money on a nightstop, their 'take home pay' will be more than the guy who likes a few beers and a steak when he's away.
It can't be just about the money, IMHO!