It is just as likely to cause over-leverage and put you in a bad spot.

Leave the emotions out of it and follow the lease…in my lease the tenant or tenants guest would be responsible for replacing the broken window within 30 days if they were the cause. 

Maybe they take really good care of the property and don't cause extra hassle to you or your PM.

Now, at a minimum, you have more info to track them down if they skip, and, with luck, she will be reasonably qualified, providing you with additional financial security at the expense of the trouble they cause.

For them it works cause they aren't sure how long they will need the place.

It's these people that are prone to being scammed cause they hear a million nos but then someone says "sure, let me send you an application" and they fall for it.

It has also caused billing issues or discrepancies, costing me extra work to keep in good standing with our providers.

I would contact the Tenant and let them know you are cleaning out the food, trash, or anything else causing an odor or potentially attracting pests.

I don't think you have any way to kick out just that roommate without reasonable cause for a non-renewal, etc., and if that roommate found out that the other roommates turned around and signed the new lease, I could only imagine the nightmare that could become. 

Heard that they have the legality to do it due to loss of cause, but the banks don’t usually do it if the borrower has a good record in paying their debt with good credit history.