A complaint where the plaintiff (or, in limited cases, the plaintiff's counsel) swears to the allegations, demonstrating to a court that the plaintiff has investigated the charges against the defendant and found them to be of substance. In many jurisdictions, a complaint does not need to be verified unless a rule or statute specifically states otherwise.
Typically a plaintiff verifies a complaint by attaching a page at the end containing a statement made under oath that:
The plaintiff has reviewed the complaint.
Regarding the allegations of which the plaintiff has personal knowledge, the plaintiff knows or believes them to be true.
Regarding the allegations of which the plaintiff does not have personal knowledge, the plaintiff believes them to be true based on specified information, documents, or both.
Bob, the problem for most people when it comes to this issue is what she says @3:35 "It's a lot of work." Be it right or wrong, most people will always find it much easier to pay the fee, sign on the dotted line and be on their way without having to spend countless hours pouring over legal documents.
...and then having to actually think about and accurately understand how it all applies to them.
If you do it that way, you are effectively on your own to figure it all out and understand it well enough to always be able to defend yourself.
...and understand it you must. If you just go with it because so and so put forth a convincing argument, but haven't done your own due diligence by learning the law inside and out, you will likely not have good results.
Doin' it the States way, they will hold your hand throughout the process in a bid to make it as easy as possible.
...and lemme tell ya, most people in society will always choose what seems like the easiest path provided to them. Even if it ultimately isn't.