The word "value" has many definitions. And values are constantly changing with time.
Good o Wikipedia, check out some of the definitions.
http://en.wikipedia.org/wiki/Value I know it's simple obvious stuff, but it never hurts to look, and you might just learn something!
Anyway, the price is pretty much dictated by the constant changing values of everything relevant to it's case like a domino effect branched off into a few major relevant factors, and several less relevant factors. One of the big ones to become familiar with, the basis of marketing, is
supply vs demand.
A company like DX can sell crappy - decent lasers for cheap because the company makes a fraction of their business through lasers, they sell thousands of other cool gadgets and stuff that overall make their store work. A company like Nova Lasers sell decent - great lasers for not so cheap because they specialize in lasers and their market is based on them therefore they are going to have different services then DX and their entire market is through lasers or laser stuff. So essentially your not "just paying for the laser", you're also paying for the service that that company provides. You're paying for the tech to guarantee it's up to spec, you're paying for the warrantee, etc.
The truth about a cd's cost is it takes about $0.02 a piece to make, but the data on it contains a certain value, that is always changing with time, as they develop new and improved programming, as music artists make new songs. So that 2 cent plastic disk can cost anywhere from $1.00 - $20,000 (as an example).