Why don't people like to write wine reviews online?
I read an article today in which the author waxed lyrical on the commercial opportunities afforded to wine retailers by having customer reviews on their sites. She made the fair point that people look for reassurance before taking out their credit cards (especially in a 'tricky' area like wine) and that in many cases (pun alert!) they value the opinion of similar others over 'experts' - they want to know what normal individuals think about a wine.
Observing how successful the customer review model has been for Amazon and Trip Advisor (a site I don't like using, as no matter which hotel you have spent ages picking out there will be some sourpuss who has slated and tainted it for you), she makes the grand claim that "early adopters <...> of wine reviews on their sites will see their sales, revenue, and popularity soar."