The only hubs that got the least traffic are the ones that I dont try to promote. The ones that I dont bother to increase their search engine rankins those are the one that get the least traffic and revenue.
Other than that my other hubs are awesome I mean hubpages rank so beautifully in Google its no joke.
I think you wont make any money with your hubpages if you dont target any keywords.
Some people write because its fun on random topics and others write because they want to make money.
When you make your hubpages think about the people who are going to find it and read it and what they are looking for .
Me personally I dont write random hubs mainly because If I cant find any keywords that people are typing in googles keyword tool then the hub wont be profitable.
I hope this helps