Originally Posted by
magiciansampras
"Worth it" depends on how bad you will feel if you don't taste and end up with a spoiled bottle. But even in that situation you could probably send it back no problem. I say do whatever you're comfortable with. Participate in the ritual or don't.

That was my original point. It doesn't matter how much they have poured, if there's something wrong with it then it's going back. So I won't feel bad at all.
If I was sampling then I'd participate in the ritual, but if I've just ordered a glass of something then Ill continue to just get them to pour it.
However as I'm often alone, there's usually ony one (or two if I'm lucky) choice of wine to buy by the glass anyway. Which is annoying if there's a bottle of something that I would like, but I need to stick to the house wine.