I'm not condoning willfully damaging something, I would never do that, however I am amused that the original poster just wanted to live the rentier dream of delegating and watching the dollars flow in. No risk (wrong). No work (wrong).

As for "collecting the rent" for the most part this is checking if it appears in a bank account. If you are exploiting someone who has finance issues then sometimes you have to threaten them if they don't pay.

They should just work on creating wealth instead of trying to exploit a need for housing for their own gain. The negative equity they found themselves in is part of the same cycle of greed.

As a another poster noted, it's a zero sum game and for there to be successful parasites others have to lose.