I would like to open the conversation on what should be the buffing used on and the economic advantages vs the market.
To start off, lets see what buffing represent as resources involved:
I will consider the "cheap" or basic buff only, once you can afford the basket, the player is advanced enough not to care for pennies saved on the dolar.
1 buffing = 1 fish dish = 10 fish
10 bread = 100 fish in thee pool = 10 dish, therefore 1 bread = 1 buff
What should be buffed depends IMO on the market price for different items.
Obviously, all weapon production buildings are worth buffing, given the large amount of raw material required to produce weapons.
The question is if other buildings ar worth buffing. One should also consider the limited amount of fish dish that is available per cycle.
Example: Beer: at level 2 would come down to 2 bier boost for 1 bread.
I for example try to buff the following buildings (all at least level 2): all weaponsmiths, stable, bakery, hardwood sawmill, marble mason. Sometimes I buff brewery, and seldom iron smith, coal mine or iron mine.