at the relative cost of vs on the relative cost of

[david11]

A: just a bit of gentle leg pulling. and not about jama'at but about the left


B: I will now meditate on the relative costs of my loyalties and leg-pulling


Shouldn't it be "at the relative cost of"?

(It is taken from twitter! I will add tweets preceding these if further context is needed for this question)

 

[Route21]

As an NES but not a teacher, I would use "meditate on".
I would not consider using "meditate at".

Regards
R21