Why are my prices not locked?

With a backorder list of approximately 7-8 years, I am not comfortable with projecting the future value/prices of my guitars.  The prices at the left are the prices that I would charge had you ordered a guitar in the past without a locked price.  These are basically reference prices.

I find pricing to be a tough assignment.  What I have found by tracking the resale of my guitars (in mint condition) over the last 17 years is that they have consistently sold for more than my current list price, often substantially more than their original selling price.

The prices that I have charged for my instruments have increased approximately 8% annually, on average, for the last 18 years. There were no increases between 2007-2010.