Just remember, Sentry doesn't prevent the door ding, and it likely won't catch the license plate of the car that does it. So all it does is document it.
There is a subjective factor that could prevent the ding. Some of my friends say that they like to park next to fancy cars because it is more likely that they are carefully. In the other hand a car full of damages that the owner don't even bother to fix is more likely to open the dor without attention. Few of my closer coworkers start to park besides me because they know chances are I won't ding them, and they know about sentry so I assume they are carefull also.
Very often sentry it takes the license plate, here everyone have front license plate. And in my work parking hall there are 300+ vehicles, even without recordered license there is a high chance of finding the car next day or having a friend who knows who the owner is.
Of course this conditions don't apply to everyone.
On the other hand I just realized how much more careful I would be if I didn't have charging at home. Right now cost and energy use are the only factors. But today there was a maintenance and I had to charge on a CCS charge nearby. It was a 150kw charger that for whatever reason was charging between 57-66kW and was significantly more expensive. If that was my charging routine I would use sentry much less.