What trade runs have been giving them most Gilda Stars?

Which are the fastest?

Do more valuable goods give better profits?

I can tell you the trade run I was doing for the past week which was strawberry jam from solzeed to marianople went from 2 gilda stars to 1 last night. So the payout flucuates

It's all based on supply and demand. The more a trade route is ran, the less it becomes worth.

The reward algorithm is a a dynamic result based on multiple input factors.

Specifically:
1) What you are bringing in trade
2) Where you are bringing it from
3) Where are you delivering it too
4) What is the real time frequency of the trade run you just completed with the same parameters of 1, 2 and 3.