Er, Zulu, you might want to re-read Jack's post because it is pretty accurate and not what he described at all. If you want to do all the stuff you describe your wife had better have a damn good job.
Remember, in most people's home countries you don't need to pay for private schools because the state provides education. Nobody said anything about a second mortgage it was just mentioned that if you want to keep a property in your home country the bills on that will have to be paid somehow. You would be braver than me to sell up and burn all your bridges to your home country if you come to the Middle East. J class holidays around the world, well most legacy carriers have a better staff travel deal than EK do. $2,000 pension contributions- again, most legacy carriers will have a pretty good pension scheme. That $2,000 a month, by the way, will not be enough to retire on unless you do something else as well. Finally, the club membership. Your family will need to do something at the weekends, especially since you will be away for a lot of them. Believe it or not a trip to a beach club can work out as one of the cheaper options. Almost EVERY leisure activity in Dubai costs money, especially in the Summer and far more so with children in tow. There are only so many times you can go camping in the desert.
Crucially, you aren't at home. That needs to be compensated for somehow. There is no point in moving your family half-way around the world unless the money and the lifestyle are both better. A surprising number of new guys come to Dubai and expect to have the lifestyle of a rockstar then leave after ten years with a million dollars in the bank- and that is what they have sold to their families. It is never going to happen and people need to know that before they come.
You can save money in Dubai and if you are careful you can probably retire before you could back home. (You will need to because the rosters here will kill you long before you reach 65.) The price you will pay for that is living in Dubai for twenty or thirty years. That is a high price, believe me. You only have one life.
Now go and read Jack's post again because I can't see any errors in it.