Yes, the co-payment of taxes for SQ redemptions via VFF are insanely expensive.
I've just cancelled a 2 leg SQ business reward itinerary, the taxes were $500+. Got all my points back but just minus a $60 cancellation fee.
A similar business reward itinerary using QFF points on QF and CX was around $250 in comparison - this was before the recent devaluation. Not sure how much it would be now as my points balance for QFF is in double digits now.
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