You don't as such pay to become an Educator, but you do pay for your Educator training. This seems perfectly fair to me, as Educator training by it's very name is the best most intensive course you will attend.
Attendees will already have reached the top level with their brand, be it Master Artist or Grand Master, therefore the Educator's taking the Educator Course will have to be International Educators. Their costs will have to be met, and their time is well worth paying for!!
The cost of the course will of course be offset by the Educators kit that will be provided which should include every product in the range...well how can you teach something if you don't have it?
Most Courses are a week in duration so technically if you get a great Educators kit and amazing Education that takes you to another level, all you really are paying out for is your accomodation.
HTH