Are there any plugins or a default MyCode that would hide post content from guests and members with less than 10 posts?
Basically if something is within [hide][/hide] - I don't want guests or people with less than 10 posts to see it...
Are there no plugins that can do this?
Hmmm are you sure that can limit based on the number of posts? It looks like that just blocks guests from seeing posts...
Create a new usergroup based on "Registered users" (name it eg: VERIFIED)
Enable "promotion system" , move REGISTERED users in this group after 10 posts in the PROMOTION settings.
In usergroup permission, for GUEST and REGISTERED users, make it so those two groups can't READ/VIEW threads ( something like that ) in the forums you are trying to deny them from reading.
On 10th post of REGISTERED users, they will be moved to the NEW GROUP (whatever the name is) , where they can now VIEW contents.