There is a special law the was passed through Congress that awards actual attorney fees to the prevailing party in cases like these. What do you think Hollywood was buying with all its campaign contributions?
There's nothing really unusual about this case-whatever the RIAA pays will be a cost of doing business. Right now these type lawsuits are an enormous cash cow for the RIAA and it's lawyers, and to a far lesser extent, the actual artists involved. What we have to decide, as a society, is that is it more beneficial to society as a whole to for us to pay for the judges, courts, etc. to support this litigation than to bear the costs of widespread pirating of intellectual property. Personally, I think we have been sold a pig in a poke and that the corporate music world is neither an industry worth protecting or de facto subsidation.