my guess is your average mum or dad and use any pc to get a cryptocoin and not need to invest in high end video cards / rigs to get them. So its open to everyone that doesn't have a gaming rig with the latest ati card. but then they are competing against not only botnets but sysadmins that can throw their idle resources at it. By the time these coin get mainstream its already gone or too hard to compete.

So the only advantage i would see is for those that cant afford ATI cards or ASICs.