There are really 2 types of companies when it comes to DevOps: those companies that and gender a culture of DevOps with their Dev and Ops teams, and those companies which hire a dedicated DevOps team. In my experience people who go to these conferences are almost always from companies of the latter type. It is often argued that the only true DevOps way is that of the former type, but in my experience the company's that talk about DevOps are more often of the 2nd type as that setup in a company is much more common.

It is like REST API's. Most folks that write REST API's are really writing HTTP RPC API's, only a few are doing true REST, but nobody cares; it does the job.