Very valid point about the bottles! I made it out last weekend on BA (RUH-LHR) and was rather surprised that the bottle of Scotch I bought for my "DF" was made of glass!
I thought all of the airlines had now switched to the plastic bottles which are a) more resilient to baggage-hall damage, b) lighter, and c) cannot be "weapons or items that can be used as weapons" (perhaps next time I'm asked that question at check-in I'll say "Yes, I have a glass Scotch bottle!!)
Perhaps the "frequent flyer" would think it less impressive if his booze cupboard was filled with plstic Scotch & Gin bottles, what the hell, it would give away that he was a cheapskate and only bought booze if he could get it cheap!
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Ah, the VC-10, Wasn't she lovely!