This may be a bit contentious to how one may wish to interpret Minor Creation
Specifically, for the purpose of poison creation
Craft (poisonmaking) as per Complete Adventurer p.98
Amount: To figure out how much poison you are able to create in a week, make a Craft (poisonmaking) check at the end of the week. If the check is successful, multiply the check result by the DC for the check. That result is how many gp worth of poison you created that week. When your total gp created equals or exceeds the market price of one dose of the poison, that dose is finished.
You create a nonmagical, unattended object of nonliving, vegetable matter. The volume of the item created cannot exceed 1 cubic foot per caster level. You must succeed on an appropriate skill check to make a complex item.
First, let's reasonably assume that the craft time is replaced with the Minor Creation cast time of 1 minute.
Second, clearly the spell produces the raw poisonous plant material.
Now, what is important is what the skill check is to create the complex item, as per CAdv:
Check Result x DC = Progress towards market price (1 dose, and assuming Check >= DC)
Therefore, to actually produce 1 dose of usable Black Lotus Extract during casting requires
4500 gp / DC 35 = Skill Check of 129
Applied across the available poisons, it's a much more stratified progression of Craft difficulty. As such, as Shaper 1 isn't easily murdering the world with Black Lotus Extract