Big differences in size, content, budget and attitude of possible attackers as well I suspect. We only have 3 galleries, any of which could be accessed by someone determined with a big crowbar. Then he would have about 15 minutes to find what he wanted before I turned up yawning, hopefully with another custodian in tow. The police used to come but they got bored with it. We suspect that this batch of alarms [I had to go out again just after 7am] was caused by a faulty motion sensor.