>> Sorry but its not a myth. Resistor packs are often mounted in the air flow
>> to prevent premature ageing. Reduced airflow = premature ageing.
I agree. I once kept chucking resistor packs at my (inherited) works Transit Connect, they kept blowing within weeks and sort of coincidentally the fan blower was very poor too. Anyway I took the thing to bits and removed the cabin filter, it was blocked solid and I mean solid, it was a bit like a lump of coal, but then again the van had been running with a blowing exhaust manifold for a while. Plus it had probably never been changed for a number of years. Anyway once the airflow had been sorted out with a new filter, another resistor pack fitted it has been fine since. Hence I conclude that the reason that they are fitted in the cold air flow duct is that they need a flow of cool air in order to stop them overheating under load.
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Volkswagen Polo IV - 04 1.6 Heater Fan S.. 
Volkswagen Polo IV - 04 1.6 Heater Fan .. 