Honestly, I don't find it upsetting that providing physical pleasures in return for food, board and occasional travel is not on the list of activities that gets somebody a visa.
Fact is, every county has the right to decide whom to let in for which purpose. If you don't like it, you can leave.
Furthermore, Singapore, with approx. 30% foreign population (one of the highest in the world), is much more open in this respect than UK (6.8% foreigners, just slightly more than EU average of 6.6% - source
http://www.guardian.co.uk/news/datablog ... ed-picture).
You really need to change your myopic views!
(Off topic, but still: Singapore PRs get almost all social benefits of citizens, besides CPF. Not Singapore's fault if you didn't buy an HDB, send a kid to local school/university or use subsidised health care!)