One is lawyer Simon Tan, 49, who has dreamt of going into space since he was six.
He said: "It has been a fantasy of mine because of characters like Astro Boy and Ultraman. It is not a matter of money but of opportunity and ability. I would do it even if it meant collateralising my investments and mortgaging my house."
For US$100,000 (S$124,900), XCOR Space Expeditions, which develops commercial space shuttles, will take travellers to the final frontier from late next year.