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 exclu

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?