This incentive was always there, from day one. It was a classic thing to put the most basic answer as possible in as quickly as possible just to get it out the door and then refine it later, because whoever posts the answer first would have theirs shown first presuming no upvotes.
This is exactly the reason I gave up on SO. It was so disappointing to see the "frist!" answer get votes, even when it was factually incorrect. By the time it took me to think and write a half decent phrase the original answer had been edited dozens of times. The site was also eager to interrupt me every time to tell me that an existing answer had been edited. They did everything possible to allow the system to be gamed and, well... they succeeded.
