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I guess it depends on your situation.
If you are a freelancer who specializes in a few languages and have plenty of work/clients consistently flowing, you only rarely need to learn new/additional languages.
If, however, your plate isn't full and you want to find as many potential clients as possible, then yes the more you know the more chances you'll find work.
If you plan to offer services, I believe it's best to form a team (or partner with fellow freelancers whose skills complement your own), such as Tanguy (myneid above) does, who each specialize in a specific language or third-party software. This way you can appeal to a large base of potential clients, without sacrificing expertise/quality.
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Skype variuscr - Email varius AT gmail
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