Only you can answer that question for yourself. There have been numerous threads on the subject - some of them probably still on the first page of this sub-forum. Many believe the "premium" liquids are worth the premium price. Others will tell you it's all marketing hype and any positive opinions are contrived by folks trying to justify their expenditures.
Me? I like what I like. Some of the stuff I vape is expensive, some not. (edit to add: I find the more expensive juices I vape to have deeper complexity and clarity of flavors - some will debunk this as some psychosomatic effect of popular opinion or fancy packaging - again, only you can answer for yourself)
This is what I have on hand today:
(expensive, mid-price, inexpensive - from left to right)