I too have such a question mind. But they answer too was there itself. Being a sincere and consistent member is what each and everyone as to be. Just doing the right thing for everyone else is the best we can do.
I had been a member for long but couldn't find time to be here. This has made me find out many changes that happened in Hubpages.
The algorithm has been changed in here as per changes from Google updates and this had effected traffic in Hubpages for good. I'm sure with good quality and informative hubs the income is bound to reach more than 50$/month. Though I became a member of Hubpages to just write and be of use, I came to know about the revenue making criterion in it. The Adsense Program and revenue Ad programs are so good for the purpose.
i wish you that you find all the answers to your doubts and make a healthy part in this community which is wonderful with lots of great minds.