Hi,
I am very confuse User Groups - Default Max Items.

Let say "Default Max Items: 5 items in 30 days"

After 30 days able to post other 5 items??

Or no more post after 30 days? In order to increase this count, it is required to be member of group?

When you want to publish new item, at that moment plugin will calculate number of published listings in last 30 days.

When you want to publish new item, at that moment plugin will calculate number of published listings in last 30 days.

After 30 days no more free right? need more posting have have to purchase / join group right?

Read it again.

When you want to publish new item, at that moment plugin will calculate number of published listings in last 30 days.

Hi
I already enabled Default Max Items 15 items in 30 days.

and new user get 15 ads live but when new user wanna post ads and system ask to pay for publish,  not for free.

System will not ask to pay.
User can only buy higher membership group to get higher limit.