Source: WowAce

Right now, Rarity calculates the various Paragon reward probabilities using the number of turn-ins it has seen the player do.
Instead, it would be awesome if you incorporated the number of Paragon turn-ins as reported by C_Reputation.GetFactionParagonInfo(factionID).
Using as an example the Army of the Light (factionID 2165), the first return value of C_Reputation.GetFactionParagonInfo(2165) returns 142260 for me.
This means I have completed the Paragon 14 times, therefore the probability of the relevant faction mounts dropping should be calculated by that amount, and not the amount of times the addon has seen me do the turn-in quests.

Considerations:

• What about repeatedly tracking items (e.g. pets)?

The cost/benefit ratio of this seems rather unfavorable. I don't think we want to implement extra logic just for paragon caches.