Commendation vs pennants/seal

[Aeron81]

I got a lv 43 NO and a lv 34 FT
but have a question about commendation turn ins vs Pennants/seal turn inn's
Why do a FT have to use 3x ammount of pennants/seal then the NO have to use to get a ship?
a NO that can deliver commendation of skill, gets a raa frigate deed for 50 skill commendations.
But a FT that can deliver Gold seals need 150 to get a Santiago trade galleon.
Why do a FT have to kill 3x more to get a ship the same level, then what a NO gets?
Cant see a reason why a trading class needs to kill more to get a trading ship, then a NO gets a combat ship.
got more DB on my NO now then i have on my FT, just by selling "free" deeds i have killed for. and used same amount of time to farm 3 ship deeds, as the Labor req for building ship's.

what is the reason it is like that?