Brother have you compared the flight prices shown on hdfc smartbuy portal with the skyscanner portal ever ? My friend told that flight prices are costlier on smartbuy portal as compared to skyscanner.I recently bought Amazon Pay vouchers from 25k points. Redemption value was 0.35.
For flights redemption value (smartbuy)would be 0.4 to 0.45 if you compare it with the prices on skyscanner.
I also had 2 smartbuy vouchers worth 5k each that I got by completing regalia gold milestone. There fair value would be 3500-4000 each. (By factoring in the 300 uber voucher)