I won't disagree with you on that, but I'm also offering

 — clean, reusable code
 — maintenance for a while afterward
 — possible design work
 — a security audit of the site
 — a site optimized to run more quickly than most sites out there

These are the kinds of things I have to charge a premium for as a freelancer, to make up for the fact that I'm not a W-2 employee who can just say to payroll "fix things for me." It's also not just code I'm giving, I'm building an entire product which includes design, support, writing documentation for future programmers and so on.

I'm sorry I have to charge more, but I try to give more too