Published at LXer:
One of the main selling points touted by many Linux-oriented vendors is stability. Once a customer buys a subscription for an "enterprise" Linux or embedded systems product, the vendor will fix bugs in the software but otherwise keep it stable. The value for customers is that they can put these supported distributions into important parts of their operations (or products) secure in the knowledge that their supplier will provide updates which keep the system bug-free and secure without breaking things. This business model predates Linux by many years, but, as the success of certain companies shows, there is still demand for this sort of service.