Usually, writing for newspapers require an official certificate that is related to creative writing, mass communications or journalism. If you don't have any, you are required to substantiate your writing prowess with a proven track record of your successfully published writing content, be it online or in print. Because of the need to reduce costs, newspaper companies are unwilling to pay charlatans or amateurs.
I had submitted my articles to five local newspapers lately, and all of them were declined because they do not meet their expectations. They didn't give any elaboration too, so it is hard to pinpoint exactly what is wrong with my articles.
Well, getting published requires a bit of luck. And the failure to getting published really demotivate anyone because there are other more pressing concerns, i.e. earning a living. Anyone in the right mind will not quit their day job to dedicate their time into writing only.