For those concerned about the high costs of an LL.M. program, take a look at this:
http://bwnt.businessweek.com/interactive_reports/roi_rankings/

As a Harvard MBA graduate, for instance, one will have to work like a horse for 7 (SEVEN) years to get his/her money back!!! As a [any top law school] LL.M. alumnus, one can recoup the program costs in less than one year - as long as the US job market keeps its current compensation level...

Conclusion: we are lucky!!!