Boarding or hoarding, sometimes it is somehow connected to human greed. If you check out the second link, you'll hear the comment that it all started off with good intentions, but it got out of hand. Sounds familiar?
That's the evil in humans - GREED.
I think what helps is to check ourselves at ALL times - am I doing this for the benefit of others, or is it for myself? If the answer is the latter, greed has set in, and it's time to move out of that zone.
Greed is sometimes not only about money, but also about taking and taking, and not knowing when to stop.
Hoarders often claim that they cannot turn a blind eye when they see animals suffering, so they take in the animal, but they cannot provide for the animal and do not seek help. At the end of the day, the animal suffers.