Depends if you think you can sell to the current owners to make a profit.
If you are in the UK (and probably many other places), doing what you suggest could end you up in court for Passing Off (getting sued, costing lots in legal fees and possibly damages).
If the domain is not generic you are probably looking at the type in value, which is simply confusion about the correct web address of a legitimate entity - think about that from a point of view of the other company and what their legal folks will see it as.
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