Selling Courses as LTI Tools

Hello, 

Our company is looking to take advantage of LTI and sell some of our courses as tools and we wanted to see if others have any experience. 

Here are some of the questions we have

1. Do we need to set up a new course as a tool for each customer or can the same tool be used across multiple customers? 
2. Is there a way to monitor or limit enrollments for customers? Ex. If a school wanted to purchase 50 seats in a practice exam is there a way to limit those enrollments?
3. Is there a way to restrict a customer from resetting a course for a student? (if we sold 50 attempts we would want them to be a 1:1)
4. Best practices for resetting a course if a consumer purchased additional attempts


As of right now through some research it seems that providers might sell access on a yearly contract basis with unlimited access. 

Thanks everyone for your help!