There have been 112 playoff teams since 1995. The average payroll ranking of a playoff team is 9.88
The top payroll team has made the playoffs 79% of the time.
The top 5 payroll teams (or roughly 17% of of the league) have accounted for 31% of the 112 playoff teams
The top 10 payroll teams have accounted for 60% of the 112 playoff teams
The top 15 payroll teams have accounted for 78% of the 112 playoff teams
Conversely,
The bottom 10 payroll teams (or roughly 1/3) have accounted for 12% of the 112 playoff teams.
The bottom 5 payroll teams have accounted for 8% of the 112 playoff teams.
What I am saying for 2009 is:
50% of the playoff teams were from the top 7 teams in payroll.
62.5% of the playoff teams came from the top 10 payroll teams.
87.5% of the payroll teams (7 of 8) came from the top 18 payrolled teams.
12.5% or one team came from the bottom 12 payrolled teams.
I think you can see that the majority of playoff teams come from top 10 in payroll. Another way to look at this is that of the top 9 payroll teams 50% made the playoffs. Of the bottom 21 teams 14% made the playoffs. That trend is pretty consistent with the past 15 years.
....Conversely in MLB to have a 50/50 chance you have to be in the top 8 in payroll and from 1995 to 2008 there were 0 teams to move from the bottom 5 to the top 8. The highest jump of a bottom 5 team was the 2000 White Sox who went up to 14th in 2001 from the bottom 5. I think it is obvious why, in 2008 to jump from the 26th rank in MLB payroll to the 8th you would have to increase payroll by $63mm dollars...
For 2009 to get from the bottom 5 in payroll to the top 9 you would have to increase your payroll by $38mm.
Obviously increasing your payroll from 18 to 19 isn't going to be significant but the magic number here is 9 right, since half the playoff teams come from from the top 9 in payroll. To get from the bottom 10 (21st in salary) to the top 9 you will need to increase payroll by $32mm in 2009 or nearly 46%.