There would seem to be few benefits to bothering with actual investigative journalism, anymore and a lot of negatives.
One problem is that it is simply easier *not to*.
If you watch media closely enough you will see countless "news stories" that are not only covering the same topic and doing so from the same perspective, but using the same catch phrases and identical story titles and blurbs. There are so many places out there (the government not the least of which) who will gladly provide you with free pre-packaged content that you just attach yourself to the by-line of and your job is done. Not only is your job done, but you've earned a kudo from the homeland.
Then there are pre-packaged pieces from pharmaceutical companies and various political organizations or activist groups. And there are plenty of pieces that are pre-packaged and then you're paid to run the pieces as if they were actual news (these are usually very easy to spot and seem like a daily part of the national morning shows on the big three networks as well as local evening news).
Not to mention the time involved. We live in a world where being wrong fifty times is better than being late fifty times. In the time you took to come up with an idea, investigate it, properly source it, write it, have it edited, and then published it -- everyone else has put up a hundred new pieces of news. They're more productive than you. They generated more content. They served more eyeballs. Those eyeballs looked at more ads.
It's better to just copy someone else's work (either through the packages I mentioned, talking points being issued out -- remember that what's his name at NewsCorp is famous for setting the company news-reporting party-line, or just through outright jotting down a story based on all the other news stories and blog posts you've read that morning). You don't even have to give attribution or source it.
As a result, we live in a world where you can say anything, push any biased lines, push any paid agendas (or push agendas simply because it's easier than producing your own content), and you never have to say that you're sorry when you're wrong. No matter the consequences. And nobody is ever held accountable for what they *don't* report, anymore. And "people familiar with the matter" and "sources say" and "it was reported" are now considered "sources". Who can doubt what you *do* report with vetted sources, like that? (Or the nasty trick we like to pull where we, as a government, plant an article in the Zimbabwe Evening Journal and then count that as a source when we go to report on whatever bullshit we're spinning, locally).
By the way, your comment seems to imply a bit of "hey, excuse the journalists - it's not their fault" in it. While I agree that there is more to lose by doing investigative journalism than by just going along with the miserable degradation of it, let's not forget that the ranks are now filling with a whole generation of the people that tell us they would rather spend on-the-clock time on facebook, twitter, and instagram and expect to be the EIC of the WSJ by the time they've had time to frame their degree, lest they feel they've been cheated, somehow.
Having had the fortune to know a great many journalists (some of them truly legitimate journalists and some of them from the old-school vanguard that held their responsibility in high esteem), I think it is safe to ultimately conclude that it is a mix of the two. It is one part completely corrupted and failed system at every level and one part non-principled copy-and-pasters more interested in putting on romantic airs of the journalist gig than putting in the work and taking the risk of it.
I'd be lying if I said I had a god damn clue how to fix any of it.