100% DIY at 55 cents for 10 mil I can't beat it. Plus this way I know whats in it I'm kinda .... that way. And if I mix a flavor I don't like its 75% cheaper than buying premix.
That is precisely my cost for 10 mL too, and I take into account VG, flavors, and nic. Of course, it does NOT include the money I payed for flavors I don't really like, or startup equipment, like syringes, bottles, etc. But its still way cheaper, for sure. What I like most about it is I can get what I want immediately, and don't have to wait. But then there is a learning curve, much like cooking good food. And yes, it is cheaper in the long run to make your own food, as opposed to eating out, but that doesn't include the cost of the kitchen. And like with food, it takes some doing to get to the gourmet level, but I find even my more average juices are somehow more satisfying to vape than vendor-bought, since I know I can just make more for almost nothing.