I know I'm not KOZ but I will give it a shot.
1. Football is harder since it is a shorter season and if you tie, it goes to a coin flip. Baseball has September callups so teams can see if their promising prospects are good enough. No team tanks it. Any sport can tank but basketball is the easiest.
2. The Heat tanked because they had more chances to get that #1. The lottery doesn't necessarily reward teams for losing which is the beauty of it.