The Knicks won that lottery, of course, launching a thousand conspiracies. The NBA had accomplished its goal, though: It had eliminated the incentive to tank. The league stuck with its equal-chance lottery until 1990, when it acknowledged that, OK, some brands of stink smell worse than others.
Teams are like people; for the most part, they act out of self-interest. The NBA just has to make sure it is not in team's best interests to tank. A simple tweak of the lottery would help.