After being here for about 10 months I have pretty much deducted the following from the writing and my stats....
I know hubs take about 6 months before they found by search engine bots (etc) so anything more recent then that I don't consider as earners.
All my hubs have been pretty consistent with traffic and fairly low. I don't have any hubs that get crazy high views daily, and I don't really have any that get 0 views daily. (I'm getting about 200 views across all my hubs daily).
Hubs written over sixth months ago: 30
Average earning per month now: $9.00
From this I work out each Hub I write is earning me $0.30 a month, or $0.01 a day!! I guess the more you write, the more you will potentially earn; but remember a Hub will continue to earn in the future. It is not a one time earner.
If you have 1000 hubs you could be earning $10 a day....wouldn't that be something!