Whole Home DVR Self Install

My question is very simple. Why is it that very well qualified professionals are not allowed to install their own service?

My credentials: I am among other things a network technician with experience in LAN/WAN/Cell networking, a satellite technician with over 500 installs to my name,  a cable technician with over 2000 residential and commercial video and data installs under my belt, combined satellite and cable builds (multiplexing) and have even worked head-end data build-outs. I have worked for AT&T Broadband, Comcast, Cablevision, Charter, DirecTV, and Dish Network among many others. I am regularly offered jobs working on cable modem firmware and electronics across the country (they aren't as good as project management).

By contrast, when I bought my house, I found a rat's nest of cabling done by Cox technicians that constituted a modern horror movie. No ground, RG-59 to RG-6 to RG-59 splices over and over, hex crimp fittings, improper fitting application, non-standard cabling not approved by Cox field service including no-shield copper braid coax of the sort used in ham radio applications. I rebuilt it all to modern specs including the downstream amps (same sort deployed by cable companies, NOT civilian Radio Shack junk).

Yet, Cox still refuses to allow me to do my own install. Can anyone from Cox tell me why? Everyone at Cox on Level One support merely repeats the extremely insulting company line that it is too complex for the consumer to do by themselves. Given that I am qualified to work at any MSO from NOC to head-end to outside plant to premises, to say nothing of provisioning an IP/ATM/Frame Relay network, this seems rather unfriendly and maybe even offensive.