There's nothing really wrong with doing it, but it is now a waste of your ever-shrinking time and your hard-earned money.
You can take my word for it, or you can do your own research to verify what I am saying here. I encourage anyone to respond with their thoughts.
Times change - Rules change. Google does not sit around and leave everything open for tricking them into thinking your article is better than someone else's. Google does not like being tricked or having their algorithms taken advantage of.
While some do not think mass submission is tricking or taking advantage of Google - THEY think it is - so it is.
So let me explain why I think it is a waste of time and money, for reasons other than what I have discussed above.
Some say not to mass submit because of a duplicate content penalty. Well, there is no duplicate content penalty, so you don't need to concern yourself with that at all. More info on that here...
Now, on to the fact that you want to populate the internet with the same information 80 million times.
When the Google spiders find duplicate content on more than one domain, they will group all of those pages into a virtual "bucket." Then they analyze all of the pages in the bucket and decide which ONE they are going to display in the SERPs - and this is all separate from the algorithm which decides where you will actually rank in the SERPs for your keyword phrases.
The bucket is re-analyzed at different intervals.
So this again raises the question...why would you waste your time and money by submitting to 50,000 different websites when Google is only going to display one of them when all is said and done?
My clients have their own customized list of places to submit their articles for each niche. They submit to around 15 different websites per article/niche. For article directories, you have to ask Google which ones you should submit to and submit to about 6 or 8 of them. "Ask Google" means that you have to sit down and do your due diligence.
Like I said above, Google is only going to display one of the results in the SERPs - so why submit to 15 different places, why not just one? Well, it's a very long story, but in a nutshell, by submitting to the 15 sites for your niche, you are increasing the chances of getting a higher ranking AND you are maximizing your chances of getting direct traffic (as opposed to organic search traffic) to your article page from well-trafficed sites, all WHILE keeping your time investment at a manageable level.
This allows you to focus on things which are more important than the actual submission process.
Think about it and do what you think is best. Many of you already know that what works for one article may not work for another. So testing is extremely important. But there are things that can be pretty much generic across the board - this being one of them.
...at least for now.