alt Hacker NewsThe only direct costs to the taxpayers in these kinds of lawsuits are the judge's time (also the bailiff's, stenographer's, and a couple more), a slight extra load on the computer system to handle the filings, and miscellaneous wear and tear on the courtroom.
That would make sense if we had infinite courts and judges, but we don't. You waiting longer for your trial date is a significant cost (justice delayed is justice denied, and all that). A jury's time is a cost. A system that enriches a select few while the rest of us get $20 off our next purchase of XYZ product is a cost. The only people receiving a major benefit aren't even the people affected by the wrongdoing.