It doesn't take long to program the pages for the site. That's not the issue at all.
Here's the deal. When we introduce new flavors, we buy enough flavorings to handle e-liquids sales ONLY for a while and see how the flavor does. If it's something that does well, then yes, we program the site and we in turn buy enough FLAVORING to accommodate the sale of both e-liquids and Doublers.
It is NOT in our (financial) interests to blow a few hundred dollars on multiple gallons of flavorings that in the end, may not do well. So, we dream up the recipe, fine tune it, and offer it as an e-liquid only so we can guage the public's response to the new recipe. If all goes well, we feel safe to make the additional investments in flavorings, and voila, e-liquids AND Doublers. Doublers require a lot more flavoring and liquid components than e-liquids do, so we want to make sure we have a hit liquid, so we don't take the financial hit if it's a flop.
It's a "loss management" protocol, not a programming issue.
We can fine tune a recipe till we're blue in the face, but it's YOUR responses to the new e-liquid that determine whether that particular recipe is worth the broader investment of multiple gallons of flavorings so we can offer these recipes in Doubler form.
In addition, offering these new recipes as e-liquids only helps US get our chops up mixing the new recipes so that we have a level of confidence and experience when doubling and quadrupling these recipes.