When it comes to content inside a members area of a paysite?

At what point do you think a site reaches 'capacity' when it comes to image sets, movie scenes, either exclusive content or non-exclusive content?

It would seem to me that charging a member today, the same as what a member from 4 years ago is somewhat unfair to the old site members.

Your thoughts, do you think there comes a point when the amount of content inside a paysites members area actually outweighs what is being charged for new memberships?

Regards,

Lee