Whether you have 500 or 5 million users, TOPYX costs the same. There are no per user/seat/license fees at all.
This will allow TOPYX to grow with your expanding learning and training needs, without making your expenses grow. When paying per user, the total cost of ownership (including the time spent managing access) skyrockets. Do the math on the total cost of an LMS before deciding what learning management system to go with.