The biggest difference is the number of players.
When the 2008 Heat wanted to tank, you bench Wade. When 2007 Celtics want to tank, you bench Pierce.
In the NFL, even the worst teams would require the benching of 3-5+ key players to ensure they lose games. It would be much more obvious in the NFL and given that the ticket holders would be deprived of likely 2-3 games using your half season example, they would be irate compared to getting say 3-5 tanking games out of 41.
The second biggest factor is the impact of the top player. The only player in the last 20+ years who has had the impact of a typical #1 NBA pick has been Peyton Manning. Tanking for Oden/Durant, Howard, or Lebron makes sense. Aside from Manning, I can't think of an absolute lock player that every team would trip over themselves to acquire. The success rate of the consensus best player in the NBA draft approaches 100%. The success rate for the consensus best player in the NFL draft is probably about 50%.
In the NBA, the drop off from the #1 to the #2 player in the draft can be Hall of Fame to 15 points a game. In the NFL there are always 5-10 Pro Bowl/All Pro players with several franchise players.
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