On Oct 11, 4:34*pm, Peter Purdie wrote:
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I would appreciate a logical reason why I should spend a high proportion
of the cost of my glider to protect the profits of a commercial
organisation.=

Because you are doing it to protect your own life, that's why; and the
lives of the people on the other airplane (you don't care, but most
pilots do). It has nothing whatever to do with "protecting profits."