Why aren't you using value-based pricing for your designs?

I have studied, learned, and slowly applied the concept of value-based pricing.
With it, you set prices based on the perceived or estimated value of a product or service.

This means that the cost of the product or market trend doesn't play a role when pricing.

It's interesting when applied. Wonderful when you charge through it.

Airplane tickets are a great example of this. Date, seat, and season affect the price even though you are going from A to B.

The interesting thing is that I don't see many service businesses using this pricing model.

It can be a local business or Walmart and they still charge by the hour.

What's your pricing model and why?