I'm not sure I see the purpose of this offer.
What exactly are you offering?
How do you verify if a site is legitimate? Do you use their services?
Do you investigate them somehow?
What is this seal supposed to mean to someone who visits my site? What guarantee are you offering them?

You say you got tired of paying $400 for validation fees so you decided to start your own validation service cheap.
What would stop me from getting a logo created and starting my own validation service and charging a dollar a year?
Why would my service be any less legitimate than yours?