I wish I knew how hubpages actually made the computations for hits that would produce adsense cash, but unfortunately its not really possible to do so, because this number is arbitrarily based on the activity being done by each user on your hub.
Hits per day really aren't as important to me, as it is the amount of time people spend on my hub. If you focus more on the content levels & quality of your hubs being produced each day. The number of hits won't matter, because each user will choose to navigate just a single hub the way they choose.
If you provide useful relevant pathways for them to interact with and possibly choose from, this will help increase the possibility that they will either make a purchase, follow a relevant ad, or go to another hub of yours or even inspect the profile to see what else you have to offer.
So the this focus on the number of hits truly won't be an accurate measure, on whether your going to be more successful here, your activity here makes all the difference in terms of hits, and the longevity one possesses in a given system such as hubpages. Income can only be earned if your viewers interact with the ad's systems you activate on your account. Without properly setting up your account, there is no earnings, so an adsense account is required as well as others, & verification of all these accounts. Google ads are activated no matter if you activate Adsense or not, as soon as you publish a single hub.
I hope this helps answer your question somewhat, its my honest experienced opinion of sorts, and I'm not downing the question, but I'm attempting to address the fact that numbers here don't tell the tale for positional success at all, for financial success to be achieved, one must be a smart and precise writer, who knows a great deal about networking with others, as well as knowledgeable of SEO & web communications amongst their peers as well.