I would never have one but I think it makes people feel control in a world they have little. One thing people need to remember is that if it is easy for you to view your door step or (worse) house interior, it will be easy for someone else to view that info too. IoT companies are notoriously crap at security (because good security is not convenient). Look at all the hacked baby monitors. Now you add in that anything you buy comes with the ability for the parent company to view that video or give it to the police. People want to "keep an eye" on their house but they miss the collective point that then everyone is watching what you are doing all the time. The next product will be made is video motion lights. When the lights come in, it will start recording. Only after people get caught on camera doing something they wouldn't want recorded will they cry "Privacy!". I don't want to live in 1984 but unfortunately a lot of people feel safer with big brother.

"Those who would give up essential liberty to purchase a little temporary safety deserve neither liberty nor safety" - Ben Franklin (yeah, I know this quote is misused but it has been co-opted into a new meaning that is relevant)