I've been reading DC for 50 years.
It's done to make money for the IP holders and the licensees. Marvel properties are spread out over three or four studios. With some properties having multiple continuities. Marvel's been playing the multiple continuity game pretty hard in comics for a decade or more, so its not exactly a DC thing anymore.
As I said, 50 years of reading comics. I'm pretty committed.

Currently DC's leading the market in sales. Sales will drop off as readers lose interest, same as they've done for the last 80 years.
I love the smell of hyperbole in the morning.