(Robin's summary post on pricing/policies is very good, and basically covers things. And he's right that the standard rule on btg pricing is charging a glass price equal to the restaurant's cost of the bottle.)
If that's a high price for you, then by all means complain about it. You might be surprised at how many of us in the business complain (and often vociferously) about those very same prices. So I'm all for letting the place know you don't like their pricing policy on wine. If enough people were to voice those objections enough times, more restaurateurs might get the message and lower their damned prices!
What I would ask, though, is that you not direct your ire at those people serving you, for they usually have little or no voice (usually no voice) in setting those prices, and there is no reason whatsoever for your server to get abused because you're upset at the owner. Unfortunately, most people DO take it out on the server. Or what might be even worse, and not say anything at all to anybody, and just appear to be generally foul tempered and irritable.
It's no faux pas to call ahead (or check the internet website today) and determine the general range of prices, along with an idea of what the wine offerings are, along with what the food style is, and what the food prices are. Also the dress code, if there is one. That way you get fewer surprises and are better able to enjoy the experience for which you are shelling out your hard earned bucks.
And while I would wholeheartedly agree with you that there's too much priceing up on wine by the glass or by the bottle, if you're getting that in all your Napa/Sonoma places.....well, you may not be going to the right places (especially in Sonoma, I can't speak for tha over priced and over rated county to the west of us). There are plenty of places where you can get decently priced wine---or bring your own bottle, if that's what you wish. Also plenty of places that offer varied sizes, tasting flights, etc. And many restaurants have wine specials, half-off deals, etc.
Heck, even in Napa, you can go to Julia's Kitchen in Copia on a certain night and bring your own bottle and not even get charged a corkage fee!
So, complain. But complain politely and to the right people. And look for those places that do better. And tell them they are doing better, and you appreciate it.
And maybe prices will go down in our lifetime.
