For 4th vs 5th you have to look at the $$ calculation.
In 4th, you get 1/3 of the playoff game revenue
In 5th, you do not get any revenue
However,
In 4th, you pay your weekly salaries and have a chance to advance in the playoffs
In 5th, you do not have a "competitive game" and therefore do not pay salaries
So, if 1/3 of the playoff game revenue > weekly salaries, you are better off at 4th...
For the NBBA, most of the time 5th is probably better.
I figure draft position is a wash.