Amsterdam has legalized homosexual marriage and here is one taking place.
Tolerance and the increase in freedoms of San Francisco and California in general led to nothing less than the computer revolution. I'll wager that, in 10-15 years, Amsterdam sees serious economic gains. If we should have learned anything from the last few centuries, it's that "People everywhere just want to be free." They will migrate to where they feel free, and they will use that freedom, both personally and in business transactions. So, in order for Amsterdam to benefit from their attitude, they should open up their laws regarding any sort of monetary transaction and their system of business regulation.