I would like to know is it worth using the unofficial fogra certification.
PSO, PSD, ISO12647-2

Is worth providing these services?
Is using these services if you are a customer?

It is fact that official PSD costs € 3.575 from fogra, the FograCert Print Check Digital is € 499

I know some companies certify printers for 100Eur !, the're not fogra but I began thinking that I send my equipment for re-certification for a reason, why not get some cash back.

As a customer I would care that such service is provided by reputable entity, with equipment control. And if they offer good price and quality results than that is all I would care about.