Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of video maven Netflix (Nasdaq: NFLX) were putting on quite a show today as they gained as much as 14% in intraday trading after the company announced that it's expanding its video streaming service to Britain and Ireland.

So what: It really just goes back to Business 101. The more paying customers Netflix has, the more revenue it generates, the more it's able to leverage its costs, and the more profit it's able to earn for investors. As such, the larger the company's addressable market, the more paying customers it can potentially accumulate.

Thus, investors' excitement over the announcement that Netflix will now be selling to folks across the pond.

Now what: For Netflix's stock, 2012 has so far been quite a change from 2011. After enduring a dreadful 2011, the stock has soared more than 40% through the first five trading days of 2012. For current Netflix shareholders -- which includes many Fools since the stock is an active Stock Advisor recommendation -- this has been a great ride. Watching from the sidelines though, a surge like that simply makes me think that there is a heck of a lot of emotion around this company and Mr. Market is not really sure how to value it.

Getting back to the news from today, as noted above, expanding its market is good for the company. Is it 14% good? I'm not convinced. It would be nice to see some execution before considering the move a full-blown success.

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This article represents the opinion of the writer, who may disagree with the “official” recommendation position of a Motley Fool premium advisory service. We’re motley! Questioning an investing thesis -- even one of our own -- helps us all think critically about investing and make decisions that help us become smarter, happier, and richer.