Our experience is also coming for Desire RM.
So not to be taken literally "sorry" not everyone is dressed in theme.
Some themes are easier than others to prepare for and pull off plus it all comes down to choice.
We do not participate in the schoolgirls theme but love the White Party, Neon Nights & Casino Nights
The percentage depends on the crowd and the time of year and if a group takeover is in effect too.
Last trip we enjoyed dressing in theme 3 nights out of 5 nights it was much more like 60%-75% participation the nights we chose at the time we were visiting.
We do use the desire forum finding out a lot in advance, connecting with others going the same time as us and it has helped in our choices.
It's fun your on vacation live it up and enjoy living out fantasies & desires.
It's all about choice