If goods buildings, boosted or not, ever bankrupt the supplies of your city, you are doing something drastically wrong.
My LMA city has plenty of supplies -> 2.9 millions. Several of my friends followed me to LMA and tried to produce alabaster unboosted, eventually caused the total # of supplies to get as low as 800, great chance to get the alabaster from my guild leader. (40 limestone for 20 alabaster + 40 ebony for 20 alabaster). If my friends put in 50 fps into my Castel del Monte, I'll give them 200 alabaster.
Anyway, they got few gold, few copper, few honey, few granite in the end.
The only time to build an unboosted goods building is to break the tech deadlock. In my LMA neighborhood, even you trade 20 gunpowder for someone's 20 alabaster, still won't be able to make up to 200 within a week. The correct answer is to collect the 200 alabaster while still in EMA or HMA, not everyone is in a strong guild, but LMA players can't go back to EMA or HMA neighborhood.
If any of my friends stuck on the LMA tech tree for more than 2 month, they really don't know how to trade, so probably be easier for them just to build the unboosted alabaster masons.
I researched the first 4 LMA techs with ->
Metal Working: 39/40
Crane: 51/52
Biology: 59/60
Aristocracy: 41/42
So I remained in HMA to fight easier Guild Expeditions and let the GBs generate HMA goods instead. As soon as the GE started, I unlocked all 4 LMA techs at the same time and pushed fast into "Great Swords" within 2 days. I had 149 copper and 197 alabaster at that night right before my EMA Black Tower readied. Of course I have HMA Royal Cascade as well, thus all previous age goods still increasing despite being in LMA.
I have 190 alabaster in my goods inventory now, this is after LMA Manufacturing and the 200 alabaster, I don't think I'll need any more alabaster for myself in this game. Cathedral of Aachen is currently at level 3.