Thanks for making this its own topic John. Marketing is often times overlooked in our industry and this topic is one piece to the every growing puzzle.
I agree, Retargeting, if not setup properly can be annoying and potentially be damaging. Clearly all of us wouldn't loose much sleep if we saw less ads. Full disclosure, we do not do any marketing for Brivo and I am not for certain as to whether they are managing this in-house or using a 3rd party but it would not be a bad idea to throttle down the frequency rate of their ads which is definitely doable on the major ad networks (Google, Facebook, LinkedIn, Yahoo and Bing).
Think Retargeting isn't a good idea? Here's a link to a Infographic that gives some interesting statistics about retargeting. There's a reason why we will continue to see more and more retargeting...that's because it works!
I'm not a fortune teller but I think its safe to say that we're just on the cusp of this and where things will get very interesting is when big data / AI learnings by publishers allows us (as marketers) to advertise to users earlier in the funnel before they start searching for products / services including physical security.
Cheers and looking forward to being able to meet next week at ISC West! I'll be sure to stop by your booth.