It is normal to human beings to bastardize any given privilege like this but be aware of penalties. There are rules which you must adhere to and ensure strict compliance otherwise, your site will be flagged red!
You're expected to ping only newly published posts or newly updated pages. Well, you may not directly add each post URL, submitting your blog URL is an indication that something new has taken place on your site.
Violation of above rule could lead to flagging your site as spam and blocking your ISP.
The question is what if I update a content, can I ping it? Yes, but not too often. A lot of bloggers don't update their blogs every day when there are other topics to write on. If you must ping an updated topic, it shouldn't be often.
I ping weekly because I try to write a new post every week but if there's a situation of updating an old post, I can also ping it as long as there's something new I want the search engines to know about.