Idea for Osclass pay plugin for viewable content in any category.

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Example Below: Adding free and Paid with a check box

EDIT CATEGORY ID: 1

Expiration days
30
If the value is zero, it means this category doesn't have an expiration
Enable / Disable the price field.

For Pay Plugin:
Check box - Free Listing
Check Box - Paid Listing - Amount $0.00
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Maybe something like this would work so all content can be seen and all paid posting can be paid for.

Osclass Pay Plugin

Example:

User Settings:  Users

User Groups : last cron Run --------


Enable Unregistered Members  on/off
Enable Registered Members   on/off

Category and sub cats for Free Listing: on/off
(Also Checked (free Listing) in Category Edit Page in check box, and ID Cat.number is used to identify free listing.)

Category and Sub Cats. for Paid Listings: on/off
Amount: $0.00
(Also Checked (Paid Listing) in Category Edit Page in check box, and ID Cat.number is used to identify Paid Listing.)

Limit user Items: on/off
When enabled, maximum number of (FREE) NON Paid listings a user can create. In order to increase this count, it is required to have a membership. Only free listings in free categories or sub cats. with (check box checked) can be posted.

Default Max Items: 10 Items in 30-days
Define default maximum items count that can be published in selected period. I.e. 10 listings in 30 days for "free". This value will be used for users those are not logged in or for those that post a free listing,(unregistered or registered).

Max Items count method: count all items
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Let's say I want to post in Vehicle -truck- Category: This is a paid listing set in the edit page of categories with a check box.
When I click on Vehicles Category on the front website page, and it opens up the sub categories, and I click on Truck , there should be a prompt to pop up saying: This is a Paid Listing
Then if the member (registered or unregistered) continues to post the TRUCK and then submits (Publish) it should go to the payment system (cart) first to make the payment for the ad, and then the ad is published after payment.

If the item is set for free listing in the category edit page, then it's just posted as long as the max default limit has not been meet in 10 items for 30days or what ever it is set for.

Then the Membership can be set just for Paid Items and no need for a FREE group. Membership - 20 post for $29 or what ever the developer wants to set it at. Silver-20 post for $29, Gold-30 post for $39, and so on.
Also: a paying member should get the benefits of posting the free listings too(only in free categories) along with Paying for a Membership.
Example: Silver Membership - 20 paid listing + 10 free listings , (Membership Price and free limits set by developer.)
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You can hook all the ID cat numbers for free or paid listing with the check box or how ever to make it work.
You can hook all, Mark as Premium, Pay per Publish, Highlight, Pay to Show Images, Move to Top, for paid Listings
You can still have the wallets and packs for the Paying members.