Well, there is the possibility of being targeted individually by a stalker, jilted lover, disgruntled ex-employee, revenge seeker, obsessed psychopath, etc. This is far more dangerous to you than either a burglar or a home invader seeking cash, drugs and property, and is just the sort of situation where the criminal may invest a week or more setting up his crime.

The name of the game in home security is the "5D's," deter, detect, delay, defend, defeat. Make the bad guy not want to try his luck breaking in, be aware of it if he tries, slow him down and complicate his task when he does, giving you time to call for help and get ready to protect yourself and your family if he succeeds, and being able to do so effectively. But about 90% of winning this game is deterrence, because the best defense is simply causing the bad guy, when contemplating his next break-in, to not pick you and to move on. You really don't want to ever get past that first "D," because that's when Really Bad Things start to happen.