amsterdam would be a good location,but it has to bring something outstanding to be really succesfull.like:24h parties
,the opportunity to sleep there if you like
,a summer location on a big boat in the harbour
,moving walls
,floors covered with sand.

concerning the music there should be a different genere of trance every night.for example monday goa,tuesday acid,wednesday minimal etc.

i would surely come on holidays although i live far.

p.s.do you have finances to start the business or is just an idea?