Another big point to add would be, just as with any addiction-- CONSEQUENCES. If it's not causing issues at work, in health, or with the law/code authorities, it's not hoarding.

There's another legal principle at work here, against the cultural fascination with hoarders, and that is the rule known as quiet enjoyment. Neighbors (absent a home owner's assn agreement) are not entitled to interfere with another neighbor's quiet enjoyment of their home. An example of this legal principle can be seen in some tenant's rights case law where landlord access and control are inhibited by that right to quiet enjoyment of their home, of a resident in lawful possession of a property. (Checks and balances thing.)

~Susan