That makes pretty good sense - and frankly, if someone wants it as a hobby then where's the fun in paying someone else to do it, unless there's a particular area that they cannot handle themselves.
My experience of "free" advice has been variable, however. It's usually fine for short and clear questions with a specific target, but you cannot expect volunteers or group members to spend days or weeks helping you with your research. Which is fair enough. I'd say if there was a market, it'd be in the "brick-wall" field, transcribing or translating long documents, verification, and so on, but less so in establishing whole genealogies.
Either way, I think the cert might be good, but only if taken with a view for extended learning or self-improvement, rather than hoping for a career...!