One thing I have yet to see mentioned is the smell/care.

A small colony not a big deal, but it always starts small and grows. Your time is worth something, the smell can become unpleasurable for yourself, friends, guests etc... I know if I didn't own a 3 story (where im able to contain) house I would not be able to justify the smell. And I'm a fanatic of cleanliness, it doesn't matter it creeps!!