This article made me laugh:
A scalable business or activity refers to one that requires little additional effort or cost for each unit of output it generates. Example: Making software is a scalable business (building it requires lots of effort up front; distributing a million copies over the Web is relatively painless). Venture capitalists crave scalable businesses. They crave them so much that the term now has become more annoying than the media’s obsession with Lindsay Lohan.