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There's some guy who posts to this site and others connected to it called the Grumpy Old Guy. I have my suspicions who it might be and he may reveal himself later (Tony?)
Anyway, some of his gripes do hit home. One of mine is the variability of servings you get in wine bars and restaurants when ordering by the glass. I fully understand the financials involved in running a business and how important it is to correctly work out cost of goods and overheads when working out selling costs but some operators forget about the most important ingredient- consumer satisfaction. Basically this is the equity in a business, the certainty of someone coming back again to buy your stuff. The poor operators use tiny glasses with minimal pours. As a consumer I feel cheated. Better operators use bigger glasses but often instruct their staff to pour out 100ml pours which come up to about a third of the glass. Most people feel cheated. The best operators use a sensible sized glass that they fill to about a half (don't measure it like in a chemistry experiment) and everyone from wine knowledeable person to casual drinker feels well done by. Unfortunately these guys are rare (although probably the most successful).
Just a footnote though: Ethnic restaurants (Chinese, Thai,Indian, some Italian,etc) usually use small glasses but tend to fill them right up to the brim. While not looking very good and a wine knowledgable person cannot swirl and sniff, you can get a hell-of-a-lot more wine by the glass this way and sometimes (not always) it's not bad wine.