To maximize Meth profitability:
For the initial production of the base meth mix, yes, quality is critical, but it hinges entirely on one ingredient: Pseudoephedrine. Supplier Shirley Watts offers Pseudo in Low, Medium, and High quality tiers. The quality you purchase directly determines the quality of the resulting meth: Poor, Moderate, or Premium / Heavenly, respectively. Unlike plant-based products where factors like fertilizers or drying times might influence quality, for meth, it's all about the starting Pseudo.
Regarding the Gas Station ingredients used for mixing (like Cuke, Battery, etc.), the available information doesn't explicitly state if their quality varies or impacts the final mixed product's value. However, the quality of the base meth (determined by the Pseudo) undoubtedly sets a crucial foundation for the value of any subsequent mixes you create from it. Investing in high-quality Pseudo is therefore essential if you're aiming for the most valuable meth mix end products. This makes managing your relationship with Shirley Watts and affording her best Pseudo a key strategic element.