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"Just saying based on that growth rate, and paying that price, after 10 years you would only make 5% PA in gains.
"If the PE currently was 20, the annual return would be much larger, 15%-20% per year."
I understand now that what you were saying was that, at the present growth rate, the present price is too high to support any return over 5% p.a. in the next 10 years, and if you want a higher return of 15%-20%, the PE has be reduced to 20.