deadspace are more expensive because their production is hard limited . The more you dropped, the less you drop. Actually you have a limit, like 30 of each deadspace per day (don’t know the exact quantity, and it’s not per day). Even if the deadspace modules were not hard limited, the commander spawns are .
So their quantity produced proportionally decreases when compared to isk.
anoms, belts and moons should also have a hard limit. quantity in anoms *24/ respawn time , for each anom.
Same for blue T3 stuff
The only things that are not hard limited in Eve is the production of junk from the agents missions - and the isk.