The other group of Libertarians (or I should say Liberaltarians) that I see are upper class or middle-upper class men who are liberal Democrats who can't bring themselves to call themselves liberal Democrats.
They call themselves Libertarians, but they vote Democrat, support Democrats, and bash Republicans and conservatives. (Real Libertarians just bash Republicans and conservatives - they are silent about Democrats...)
Their patron saint is Bill Mahr (who also calls himself Libertarian, but is really nothing more than a socialist liberal Democrat.)
With the Liberaltarians, there's not a dime's bit of difference between them and the Democrats (to use a variation of a phrase the Libertarians are very fond of).
To me, a true test as to whether one is a Libertarian or a Liberaltarian is to ask them if they are for "universal" government run health care. If they say yes, they are Liberaltarians (and you would be suprised at how many people who call themselves Libertarians will say yes).
I know the type: they are typically older - in their 30s, 40s, and even 50s - and constitute the Peter Pan League. They don't want to grow up, especially if it means putting down the reefer and putting down roots instead.