It's also worth pointing out that fighting piracy is only one part of what the MPAA does. Their budget also covers the entire film rating system, quite a bit of industry research and reporting, and lobbying at the state and federal level for things like tax breaks, union regulations, etc.
If you also correct for that spurious division by 2 but keep the other assumptions, the correct figure for increased revenue should be $120m.
Needless to say, 64 is not greater than 120.