You are absolutely correct and security installers are seeing more and more competition from IT companies. We as a manufacturer encourage the formation of partnerships between IT companies with network experience and CCTV installer with camera / matrix / alarm and detection experience, and have seen great business success through these partnerships.
You are also right in saying that the connection and configuration of the device to the network is just like connecting any network peripheral, however most IT companies see this as an area they would rather sub contract than get involved themselves.
Source
Security Installer