I considered that [Priceline], but I don't suppose Priceline supports buying a half-roundtrip in Economy Value and the other half in Business Campaign.
If I can still do arithmetic, with the economical half in Basic, earnings are "only" 28,125 points, versus 20,000 for a plain HEL<->SIN round-trip in Value fare
and that's if I don't skip the last leg, otherwise, even only 25,625
