The cost of living is, within certain limits, what you choose to make it. You can live simply and save or you can get all the fancy toys and the loans that come with them and not save.
But, if you are coming just for money I suggest that you may well be very unhappy, very quickly. It is vital that you, and any accompanying family members, know that there is a good chance of you being happy in Dubai before uprooting your existing lifestyle.