Do not use such bulk service. Just 10-12 will do just fine. Web 2’s are a great way to stack the authority. So, create them manually with some unique content. Go with this schedule.
TAT: 30 Days
Create 1 post on every blog - 1 day
Post another article on every blog after 2 days
Wait for couple of days
Again post another article on 10 blogs.
Wait for a week.
Now update the second article with your blog link and post a new article on every web 2.0
After few days post another article on every web 2.0
This way your web 2’s look natural to the bots. Blogs won’t get deleted after some time. Update them with new content every month.
PS: Follow this method ONLY, if you’re looking for long term business.