If you get the first house upgrade (it's $250), it'll generate 0.5 cans without using money. It would probably be best to get it before you get the labeler so you don't run into the 'no boxes, no cash, no cans' problem.
You should make it so that the country will be accepted with all forms of the answer. I figured it out early, but had a "wrong answer" because I capitalized the first letter.
There isn't an upper limit on properties that you can own, but they do get more expensive the more you buy.