The only thing I can think of (and I hate their pricing too), is that they are a manufacture that started for, and markets to, Vapers... only. While other major concentrate manufactures (CAP, FW, TFA, LA, to name a few) get the lion's share of their sales from the food and beverage industries (F & B uses much larger quantities than typical e-liquid demands). With a smaller targeted market, it stand to reason (to me; anyway), that they may have to charge more to remain a profitable company.
Looking at it in that light; the cost seems a bit more understandable.
Regardless, more money is still coming out of my pocket. And, for that reason, I will not "experiment" nearly as often with FLV. I will let someone else with deeper pockets play guinea pig for me. I require some convincing, that a particular FLV concentrate is extra special, or the only manufacturer offering it... before I will throw my cash at it. So, I read lost of opinions, and detailed reviews before I open my wallet.
Some of FLV's concentrates
are special, and/or unique, and are worth the cost... even to an old cheapskate like me (Basil and Raisin Rum; are two that come right to mind).

But others, are just average, and can be easily subbed out for less costly alternatives. Like any other ingredient (food, beverage, or vape), each mixer ultimately has to decide what they do and don't "have" to have.
Pacific northwest wild harvested Morels may make my stir-fry a dish to make the angels weep; but, on my budget, grocery store Creminis usually have to do. Does it taste the same? An emphatic "NO!" Is it still edible; and even taste "good." To me, it does... and that (like DIYing e-liquid) is what matters most... making something I enjoy.