How can such horrid primal drop rates even exist?

[Tonkra]

Or how about increasing the drop rate slightly for each successfull win for each character up to a maximum cap.

to recompense all who have beaten the primal for hundreds of times and still not receiving a primae weapon. because its unfair when i have beaten moogle for 20+ times getting no reward except dark matter.. and someone who defeats him for the first time receives a weapon drop.

i think the success rate should be increased each suscessful run. (still with a maximum cap)
but in the end the success rate for me should be higher than for someone who has beatin it just 1 time