I think 30K is entirely possible. Just imagine all the families from Malaysia and indonesia that do not have the time nor can afford to fly out of the region.
Family of 4 - 2 nights in Singapore $300 hotel (cheap hotel), $40 x 4 ($160) tickets, food for 3 days $200, parking ERP etc $50. All in all $700 to $1000for 3 days 2 nights - can walk around casinos, window shop for the wife and highlight of trip is Universal Studios. I think it is very affordable.
Big question is the impact of the heat, rain and humidity on the whole park experience.