2. Where visitors do go is 100% random and, with the exception of VIPs or an apartment with a vacancy, do NOTHING anyhow - they don't buy anything, they don't sit down on the couch for X-Box game at a full apartment, etc.. You get the tip and they wander off to the right and disappear.
What you are stressing out on are irrelevant points you have no control over.
Game Center : "Chip H.". Grand Poobah of Troop "Touch Arcade" in Battle Camp (referral code: hns1w1 )