[snaky]

It depends on what the role is and many other things, the same as it is in any field. Of course, highschooler in Brazil who recently read a half of 'COBOL for dummies' in two weeks would not earn much more than other who choose 'J2EE for dummies'. Deep knowledge and experience could bring significant profit, but the same is true for almost any other industry - maybe J2EE performance consulting for z/OS with CICS would pay more than J2EE performance consulting for AIX with TXSeries but not too much more.