It's also possible that knocking the door down is less effective in wealthy places. The reasons to knock a door down are things like flight risk, destruction of

It's also possible that knocking the door down is less effective in wealthy places. The reasons to knock a door down are things like flight risk, destruction of evidence, etc. You can mitigate the flight risk more easily if the property has gardens around it, and knocking the door down might make it easier to destroy evidence because an FBI team would take much longer to sweep a big house. Obviously I don't know anything about FBI tactics, but it's conceivable that they choose what to do based on experience of what works best instead of just applying the same strategy regardless of where the property is.