Read Please...
Why would you want to subscribe?
What you learn here has real value and you would like to help fund the costs that are associated with running the site and making it more popular and far more useful for all.
If you gain something from what you read or receive here then maybe it might just be worth giving something back, even if only from the selfish viewpoint of keeping the whole thing going!
You get access to the private contributors' forums. They are made up of some of the see more best professionals sharing information on community software and effectively helping each other on a regular basis.
Your profile is marked as a "Contributor" profile, which effectively improves the willingness of other members to help you whenever possible.
You can save premium thanks to significant discounts for Contributors, voluntary provided by other members selling their products through "Extensions" system.
You can make use of occasional special offers provided via Unity "Specials" system. Very often these offers alone can be valued many times more than a nominal Contributor status fee.
As a Contributor you are able to order an ads box here at Unity and promote your products and services.
By purchasing contributor status, you are on your way to beginning a great career here as a professional expert or BoonEx pundit. You won't be a standard member anymore, even if it expires.
By contributing to Unity, the Community of Communities, you help us in the Unite People mission. Join us, and help us build a compassionate, humane and caring community.
Purchasing a contributor star (point) allows you to become a part of the big Unite People movement, and we acknowledge you as our first row co-fighter.
Note: Given that this is a service, all subscriptions are final and refunds are not granted.

Thank You - Unity Administration Team

Nowhere did it say you had to contribute $20.00 every month. In fact, it just ask for a single contribution and you're forever a contributor. Which I would believe you could sell your "products" all day only paying $20.00 bucks once.