The forest for the trees...
The factors I use are, storage, portability, convince, and cost. Although, cost is a major consideration.
I live in a rural area and to get the chems I want, everything needs to be shipped. So I try to buy in bulk. I also try to buy the highest dilutions I can find of quality products. It's a pain for me to reorder and I don't enjoy doing it. Space is precious in my van and storage area, and I'm a cheap/lazy bastard. (Not really)
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So anyway, cost isn't the sole reason for my mindset.
The factors I use are, storage, portability, convince, and cost. Although, cost is a major consideration.
I live in a rural area and to get the chems I want, everything needs to be shipped. So I try to buy in bulk. I also try to buy the highest dilutions I can find of quality products. It's a pain for me to reorder and I don't enjoy doing it. Space is precious in my van and storage area, and I'm a cheap/lazy bastard. (Not really)

So anyway, cost isn't the sole reason for my mindset.