As a business owner myself (though not in the e-cig game), I know that the
cost of the item being sold is not the only thing figured into the retail sales price. All businesses have overhead, such as advertising, wages to employees, bills for electricity, water, etc., and other costs that have to be figured into the cost of the products that they sell. Additionally, I'm sure that certain flavorings cost more than others.
Depending on who you're ordering from, the likely reason for the prices being the same across the board is not only to make up for the lower profit margins on other nicotine levels of the same e-liquids they sell, but also to make up for other costs they incur as a business. If they were to charge the same profit margin on each strength for each flavor, they'd have widely varied pricing throughout their liquids, which would likely make some flavors less likely to be purchased. By making every flavor and every strength the same price, no single eliquid (of any flavor or strength) is going to be more cost-prohibitive than any other. While they might make less money on one product, the amount they make on another certainly makes up for it in the end. It's even possible that the very flavors you enjoy are among those that make the company the least amount of profit.
(Sometimes, I hate that I have to price the things I make. It's a painful process, really, to determine how much something you've created is "worth" when selling it. Business can be quite painful!)
