That was basically what I took away from the article. Start by offering free accounts until you gain some sort of traction and people become aware of your product, but once you start getting significant traffic stop with the free.
Something else to take away: don't require people to give away their billing information upfront when signing up for a trial; simply downgrade their account if the trial period ends and they haven't paid yet.
I wonder how well offering free accounts, getting rid of them and then grandfathering the free account users would work. How would the free users who have exclusive free accounts behave? Will they be more likely to promote your product (aka bragging) or would they be inclined to try to sell their account to someone?