Well, some people can't sleep at night because they're worrying there might be somebody, somewhere enjoying themselves. Maybe dancing to music they enjoy or maybe driving a nice car - just something that the person doesn't like / can't afford / doesn't understand / is not able to do themselves. Sadly, there are plenty of people in the world for whom this a good enough reason to hate and act (or dream of acting) aggressive towards the ones who are enjoying themselves.
The club culture presents an antithesis of this mentality. Clubbing is about enjoying yourself and loving others to help them to enjoy themselves as well. Unlike the people described in the first paragraph, clubbers get happy, not angry, from seeing someone else being happy.
As for myself, through the 90s I used to party all over mainland Europe. In 2001-2006 I went to Ibiza twice every summer with my wife, spending thousands of euros there every year. In 2006 the situation was not as good as in the previous years - more aggressive police, too crowded at DC10, Cocoon after parties closed down by cops.
Last year I was planning to go again, but then read about the club closures and even more aggressive police. No Ibiza for us, instead went to Berlin 5 times last year.
This year I was thinking of going again but then saw the news on this site. So, at least here you have a factual example of a "quality tourist" (in terms of education, income, choice of restaurants etc) deciding not to go to Ibiza because of the new policies. And I don't think we're the only ones.
It seems many people here think Ibiza is the only good place for parties and they haven't experienced a wide variety of parties. Having quite a lot of party/club experience (18 years of weekly going out to dance) I think the best parties are:
a relaxed. You can move around freely, dance, chill, come and go as you wish.
b have friendly people (doesn't hurt if they look good too)
c don't have aggressive people, including bouncers or police
d have super music (obviously)
e don't cost an arm and leg
f beautiful location
Now Ibiza is having big, big problems with A and C. E too, but I can afford it so it's not a deciding factor.
I'd say Cocoon afters on the beach are parties which tick all points a-f. But in puritanical Ibiza they are not allowed. Fortunately you can find plenty of parties which tick all points in mainland Europe.
Now to compare the top city party destination in Europe, Berlin, to Ibiza. Sorry London people, if you think London is the top city party place you just don't know what you're talking about (I go to London about every month since 15 years so feel rather at home there).
+ Berlin has much more parties and clubs. It's common to have more than 100 different public parties in one day.
+ Berlin is much more relaxed on the bouncer front. Very much more on the police front. It's also safer overall and basically you don't have to worry about anything at all.
+ Berlin is much much cheaper. You can go around the city 24/7 for 2,10 euros with excellent public transport and club entrances are about 10 euros.
+ Berlin has more progressive and underground music. Yeah I know Morillo is good, but you only want to hear the same songs and mixes x times in a season.
+ Berlin is a super creative, funky, in-progress place
+ And, of course, in Berlin you can party 24 hrs a day no problem at all.
- Ibiza has better weather.
- Ibiza has better beaches (BTW Berlin has ok beaches as well)
- Ibiza has fancy, large clubs like Pacha or Amnesia
- Ibiza is more cosmopolitan (although Berlin is pretty cosmopolitan too)
There you go. For people who are mainly experienced with Ibiza-style commercial clubbing, I'd suggest a European trance festival in the woods. That should give you some perspective.