I think they call it "oncorking fees" or something. Storage, etc.
The pricing per glass is definitely more of a rip-off than a bottle. I don't know if the bottle's markup is more or less than the markup on other drinks. Interesting experiment
I believe you mean UNcorking. But I'm pretty sure that they would call it is ensuring a profit margin. Think about it... When they open a bottle of wine and then sell it by the glass, they're taking the risk that the entire bottle won't sell within a reasonable timeframe (excuse my ignorance, but wine can go bad once opened, right?). If you buy the whole bottle, it's a guaranteed sale. So I'd be willing to bet that at least a part of the price differential is due to this (as well as to the fact that they can get away with it). Also think about going to the store to buy, say, detergent. You pay more per unit when you buy the smaller container. Similar logic here.
I think Jericho nailed it when he said "pricing per glass is definitely MORE of a rip-off than a bottle" (emphasis added). It's a ripoff either way, it's just worse by the glass.