Yeah, RAW recoveries rarely ever find a useful amount of data. Even though these viruses create a new encrypted file first then delete the original, they overwrite most as they move on to the next file, and the next... I was doing these for a while at my regular software recovery rate but I had to stop. The customers are never happy with the result so they don't want to pay afterward, or they ask for some crazy discount because of the small amount of actual recovered data.
Now when people ask, I just point them to the software section on my site, tell them to download a demo appropriate to their OS and see what it finds. At least I can make a $20 commission that way and not waste my time.