The problem, of course, is that entertaining--on any scale--blows through glassware at an unbelievable rate. Six person dinner parties require multiple dishwasher loads (cocktail hour, supper, digestifs, nightcaps, ill-advised raids on the Calvados at three in the morning...).
And then, as we all know, stemware is aggressively not stackable, except in the context of champagne fountains, so one requires extensive flat real estate for each separate glass. Add glass's tendency to shatter, and the logistical nightmare expands rapidly.
I guess when we have finally transferred all our books onto our magical electronic thingies, we can use all those bookcases for glasses. But then there's the dust issue.
The answer, as always, is an enormous house and an army of servants.