I just spent about 30 minutes searching the net and didn't find much. The only actual cost benefit that I found was for the UK. A lot of other sites said to calculate it but didn't give any other information.
Nationwide Building Society - Home Energy Advice - Cost benefit guidelines
My wife and I blew 35 bags into our house -- about 10 into our interior walls (sound deadening) and 25 into our attic (extra six inches). In our area, the box stores will loan you a blower if you buy 20 bags. We divided the attic into grids so that there was a natural stopping point for hose repositioning. We used walkie talkies to communicate but couldn't use them very well through the respirators. We settled on keying the handset multiple times to tell my wife to shut off the machine. Break up the insulation as it is fed into the machine.