While one individual may present themselves as a representative of a company, that's a poor assumption to make on anyone's part.
If I understand the OP correctly, one e-mail has caused a lot of folks to conclude that 5P is of one single mind on this issue. Was a board meeting convened to discuss this policy, or was one employee taking his personal problems out on the OP? Who could possibly know, other than the individual that sent the snooty e-mail to the OP?
So 5P juice is expensive, that is not a hidden factor. Rude, condescending, and/or poorly worded communication should never be tolerated by a customer.
The customer is always right, but only when an unsatisfactory issue hits a unresolved dead end.
If you want a product and are treated poorly by a company's staff, complain to management. If the management does not satisfy you, complain to the owners if possible. If these methods fail,
then tell the world about your experience. I've spent my time in customer service management positions: customer complaints happened, free products and services were offered, and staff was either warned or fired. People can behave poorly for a variety of inexcusable reasons, don't let them get away with it! This "story" is the result of one staff member's actions. Human's often make mistakes even at work, maybe this 5P employee needs to think about another job. Whoever this clown was that e-mailed the OP needs a spankin'.
That said, I still won't buy 5P e-liquid because it's waaaaaay too expensive for me. That's

x500 I would never spend on a 30ml bottle of e-liquid. BTW, I hope 5P does read this thread.