It all depends. There are different kinds of money making hubs. There are hubs on how to make money online, how to make money on HP and how to make money (general).
If the hubber is new and writes a hub on how to make money on Hubpages, I am less likely to believe he/she knows what they are talking about.
If the hubber is new online and writes a hub about making money online I am less likely to also read that.
A hubber has to have some sort of experience online or on Hp for the hub to make any impact.
My hub on how to make money with your hobbies have been tried and tested. I have made money with my hobbies and I did ask a few friends about what hobbies they think they can make money with. I have not made money with all the hobbies I listed but other people have so that hub has credential.
My hub on how I make money on HP and other freelancing sites was written because a hubber asked me based on my profile so that also has credential since I do make money via these methods.