> Any medium sized graphics shop could have a full developer on the payroll for a fraction of the repeated licensing costs of proprietary solutions, that is, someone who works full time on Blender and whom you can directly approach, in-house, for features and fixes.

DIY is time-consuming, difficult, and doesn't scale. Small companies often start out with as cheap a solution as they can, but as they grow they'll find they're doing way more work just to support the DIY solution, and features are difficult and time-consuming to produce. If you have the money and you need a feature now, licensing makes sense.