What's the threshold for it being worthwhile to build a ubiquitous surveillance system? 365 dogs saved per year is apparently enough. How about 100? 10? 1? I'l

What's the threshold for it being worthwhile to build a ubiquitous surveillance system? 365 dogs saved per year is apparently enough. How about 100? 10? 1? I'll also note that this is just a count of the dogs found by the system, not a count of dogs that otherwise would not have been found.