You think Hikvision's valuation is incredible at ~$12 billion?
Well, the site where people buy super cheap Chinese cameras (and tons of other things) is going to have an IPO that is projected to be at least 10x as large (see a WSJ overview and their S1 Financial filing).
Just in surveillance, Alibaba lists a million cctv cameras from over a thousand suppliers.
Analysts are projecting a $150 to $200 billion USD valuation. That would make it bigger than Amazon (~$135 billion) and Cisco (~$110 billion).
Alibaba does not have huge revenue relatively speaking - annual rate ~$7.5 billion but it has huge profits with a net income percentage of ~50%.
For surveillance, I suspect the IPO, and resulting publicity will help increase their brand and product recognition, bringing more people to use / buy from them.