I'm working on a long post about relegation and promotion for MLS, but in the meantime, I found a list of salaries for players in MLS.
MLS Players Union :: Player Salary Information
The total of all salaries this year is only $42,000,000.
Highest, LA Galaxy - $9.3 million
Lowest, Chivas USA - $1.7 million
In baseball in 2006:
Highest, NY Yankees - $192 million
Lowest, Florida - $14 million