Dunno where you are searching, I see a variety of airlines available on randon September dates in the 6-7,000 DOLLAR range per person, so we are talking about 14,000 EUROS rather than 40,000 as you are stating. Furthermore fares to SIN can be had in the $5700 range PP, so it would be even less and one can get very cheap SIN-DPS tickets with enough advanced notice.