I know that some hubbers have done that for themselves.
The biggest issue with using Hubpages as a way to "show off" your writing, in my opinion, is the fact that anyone can post anything - it's not like you're writing for somewhere with editors who can reject your work. At least on your own blog or website, you're not sharing space, either.
I usually just tell people to look up one of my hubs in Google, then they're even more impressed than if I handed them a business card to some random site.
Some people also create their own blogs "linking" to their hubs. So then you have your own 'official' website at least.