Good Day dabeaner
I am pleased to see that more and more hubbers are noticing this problem and talking about it. From what I gather, visiting the hubber knowledge exchange, the spam question problem you've identified has at least two sources.
One hubber identified a source as hubbers desperate to build up their hub score by "participating." They may also want to accumulate those "accolades." We're talking about legitimate hubbers now.
They are, paradoxically, taking HubPages way too seriously. This seems to be a life and death enterprise for them. Obviously they want to build up an online profile, and portfolio of work. They want to make money and are willing to degrade themselves to do it. They want to be famous so badly that they are willing to settle for infamy.
They are willing to go the William Hung route. Remember William Hung -- that glass-shattering "singer" from the first round of the first season of the first show of American Idol?
These hubbers are posting dozens of questions each week! They can't possibly want to know all of those things. They have clearly fallen into the trap of thinking that quantity equals quality. In asking so many questions, quality is bound to deteriorate -- but they persist.
There is at least one other source. As gramarye said, some people who ask particularly abysmal questions have a completely vacant profile, nothing. There seems to be a bit of what I like to think of as guerrilla blogging, going on.
They swoop in -- not unlike vultures -- make some innocuous comments somewhere, advertise their own blogs, other sites, and so forth, thus, theoretically boosting traffic to their own sites. I wonder if they're getting "professional" advice to do this kind of thing.
Come to think of it, I've occasionally been somewhat perplexed at the "hubber" who may have published between 1 and 5 hubs, joined a day or two ago, and yet manage to have thirty, forty, or fifty followers! How did that happen? With such a small body of work, there isn't much to follow yet -- what are they following?
Anyway, I don't think its a lack of intelligence, as much as desperation for Hub score, money, and the pursuit of fame (infamy).