Should I fly by JetStar or...

Planning to Taiwan, air tickets cost:
Adult $89.00
SFT $147.00
Airfare per Adult $236.00

Child $89.00
SFT $147.00
Airfare per Child $236.00

Return tickets to Singapore cost:
Adult $158.00
SFT $142.00
Airfare per Adult $300.00

Child $158.00
SFT $142.00
Airfare per Child $300.00

Hmm...airport tax already cost $147 - $158 each way? It is really getting very expensive to travel nowsaday. I need a VACATION soon! Somebody please do something to the airport charge!