Dubai is a playground, business deals are definitely completed there and it is home to many millionaires - but it is still a very fake country. No big businesses are going there to setup their main headquarters and store money within the reach of the UAE authorities. The mindset has shifted slowly, but there is no getting second citizenship in Dubai, you will always be an outsider unless you were born their and their citizens get a lot of perks thanks to this. It has a very biased and heavily religious influenced legal system which is not acceptable for most mega scale business dealings. If you go into debt in Dubai, you will be jailed until you pay it off, this is not a normal practice in most other advanced economies.
Inasmuch as the businesses are been setup,they don't seem to last for longer years.Dubai has a high level of promoting and legalizing businesses,a lot of persons are still not comfortable with Thier pattern of activities as they consider them baised and highly religious over their affairs of the country. Dubai is not for everyone and growing businesses, because one might get disappointed in the long run.