Interesting, comparing the rip-offs in the cost of petrol and whisky.
One point not yet made: They don't store petrol for six years before they sell it, and watch 20% or so evaporate in that time.
That is like growing trees for profit; you'd better have another source of income in the meantime.

Sorry about the faulty maths up the top there. Tried to correct myself but couldn't get back on. Frequent occurance.