Does anyone else get so annoyed with loud cell phone calls onboard that you book a ticket in the quiet car instead of upgrading to first class?

If there were a first class car (or portion of a first class car) that was a quiet car or quiet zone, I'd book first-class tickets much more often than I do.

Curious as to others' thoughts, and how much more revenue Amtrak might gain if the new Acelas and new Northeast Regional trains had first class (or business class on Northeast Regional trains) that was also a quiet area.

Thanks.