I too have heard this illustration many times before, and I am sure I have even used it myself.
There is a lot of truth in it though and it is a mechanism used by the WTB&TS to keep its grip on people. If you are at the center, there is lots of activity to keep you 'hot'; field service, meeting parts, lots of association, etc.
What the WTB&TS fail to recognise is that it often themselves who do the cooling by bannishing and cold shouldering members they feel are a threat.