I've lots of prices (all in HK$)

Gift miles from asiamiles.com: $0.2535
Top up miles from asiamiles.com: $0.234
Purchase from taobao (direct credit) non compliant purchase http://lovelovelings.blogspot.com/20...miles.html?m=1 : RMB0.15 or roughly $0.18
DBS (and formerly SCB) sale of miles to cardholders from time to time: $0.18
Hongkongcard.com award miles ask price (whole awards): $0.108-$0.115
My value in use: $0.102 or so
My cost of acquiring miles thru trading: $0.08 <-- I have been refusing miles redemptions for monetary opportunity cost above that (eg if I can get $0.1 coupon (roughly $0.095 cash) in lieu of of one mile)
Cashing out a mile thru Parknshop MoneyBack: $0.05

If you are asking for value then $0.102 is probably the closest for me

I drew all these values on a whiteboard once before a financial arbitrator (HK's FINRA)