Interesting, good find. You're right in that one essentially becomes an agent 'under' them, but they do note in the FAQ that you can call a vendor directly and request travel agent rates (instead of using their booking engine, which would earn you some commission). You would just need to present to the vendor your credentials upon arrival. Here's the catch....

Q. What is the difference between the InteleTravel Agent ID Card and an IATAN ID Card?

A. The InteleTravel Agent ID Card identifies you as an Independent Travel Agent with InteleTravel. It bears the 8-digit International Airlines Transport Association (IATA) number issued to InteleTravel. The IATA number on the InteleTravel Agent ID Card is used for tracking purposes by travel industry vendors extending travel agent privileges and discounts to InteleTravel's Independent Agents. You should determine in advance of booking what an individual vendor requires to extend travel agent privileges or discounted rates. Extending travel agent privileges and discounts are matters of discretion with travel industry vendors that may depend upon space availability and other factors. (My emphasis, not theirs)

Ah ha, so it's up to the individual vendor to decide whether they take the InteleTravel ID. I almost feel like the Intele ID is like using a fake ID (if the IATAN ID is considered the "real deal"). Might get caught, might not if the desk agent doesn't care or doesn't know better! Then the question is, do you show your cards ahead of time and make sure that they would accept this InteleTravel ID (thus giving them a chance to investigate) or do you gamble and wait until check-in, hoping you get an agent who might not know or care one way or the other. (This is assuming that you're making the trip to that resort regardless of a possible travel agent discount).
Hmmmmm.......