Suppose you're a customer buying from yourself. Why? What reasons do you find persuasive?

If identical products can be purchased for a fraction of a price elsewhere ... and that "elsewhere" is more visible than you, then you'll have a difficult time.

If, on the other hand, your offering is unique, exclusive, rare, then your pitch will be more credible.

Transparency also helps. Customers understand economies of scale. If you can explain yourself, then they may listen. But don't present your pricing with an apology. Massage the phrasing. You're not small; you're "boutique".

You're not overpriced; no, you respect the artists whose selections you offer – enough to pay them fairly and not cut corners on production costs. While other vendors work with an "assembly line" business model, you take pride in each piece and give it individual care and attention. And so forth.

If you'd like help crafting the words, I can help write copy for landing pages, brochures, etc.