To be honest, their tiered T&C's are now so confusing, I find it very difficult to tell whether I'm better off on PC or Platinum... and I think that's the whole point.
My interest rates are significantly better on PC, but me fee is slightly higher and my eBucks rewards are about R100 pm less. So, I guess it boils down to what is more important to you.
Thinking long-term, I am sticking with PC in the hope that I will get eligible for better bond terms when buying my first home in the next couple of years. Thinking short term, I would be better off on Platinum. If someone can definitively prove to me that the tier I'm on will make no difference i.t.o. getting a bond, I will downgrade to Platinum ASAP for the eBucks.
In terms of earning requirements: FNB doesn't adhere to their own requirements. Those are made up so that people can feel "special" when they are are offered an upgrade. I am sure that they would allow anyone on Platinum to change to Private unless that person previously demonstrated bad banking behaviour.