Before you go deleting ALL your paid post, please bear in mind that not all paid post can be deleted. Some are required to stay put in our blog permanently.
Blogsvertise - Your blog entry must remain online and be a permanent entry in your blog.
SponsoredReviews - We require it to be live for at least 30 days else we will refund the advertisers money. However, any blogger found to be purposely deleting reviews after 30 days will be removed from our system, as it is not standard practice for a blogger
to remove past posts. The exception to this rule is if your site changes platforms,
or your entire archive is being deleted.
Smorty - Your blog post must remain online and be permanent.
Bloggingads - Posts are expected to remain permanently.
I think it is also permanent for ReviewMe and Payu2blog. Can't find the clause in their TOS.
Blogitive - Each link will be left up indefinitely, guaranteed for up to 1 year.
Loudlaunch - The post should also remain accessible from in your archives for at least 45 days.
PPP - min 30 days but I can't find the clause in TOS too.
Linkpost - You must keep the post up for at least one year.
As for v7n, I don't know. Anyone?