I'm hardly what you would call a pro hubber, but I do seek out the top Hubbers who are also professional internet marketers and I have come to a conclusion of sorts.
There are some top Hubbers with very high profile scores, who write top notch hubs yet probably don't do any keyword or niche research and really don't gear their hubpages for search engine queries or commercial earning$$$.
On the other hand there are some other top scoring Hubbers which do well within the Hubpage environment but also get loads of traffic from search queries.
In summing a hubber really want's the largest possible audience, but especially so if they are looking to make a buck.
It's a cold hard fact that the best way people will find your content is through search engine query so it pays to monitor where your hubpage traffic is coming from and if all of it is coming from within hubpages, you might want to make some SEO changes and do some focused backlinking.