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 speedy business-card maker Vistaprint (Nasdaq: VPRT) fell as much as 10% today after announcing an acquisition.

So what: The company is purchasing Webs in a $117.5 million deal to expand its reach into Webs' do-it-yourself sites. Vistaprint will pay $100 million in cash and $17.5 million in restricted stock for the company.

Now what: The market obviously isn't a fan of the deal, and even management expects it to lower earnings per share in both fiscal 2012 and 2013. The price seems pretty steep for a company with $9 million in revenue that isn't expecting to be profitable until 2013. I'm not buying this move today, and I think the company could probably have found better value elsewhere.

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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.