It seems that a casual reading on this site would lead to a reasonable conclusion that quite a few people spend thousands upon firearms, ammunition, and related equipment.
Also, when discussions regarding equipage arises, an emphasis (correctly) is placed on the need for spending time and money upon training.
I think that another emphasis should be consistent made: the existing actual quite good performance of modern technology should mandate a full perimeter (and interior) wired or wireless observation/detection system, replete with lighting systems, for those who are seriously concerned with potential prowlers or intruders.
Being able to see, hear (and challenge if one desires), recording all, while remaining within the protected envelope seems to have zero negatives.