Why don't we just stop this and admit it is user preference. If a user feels safer to buy an AV for the Mac, then they have every right to do that, since it is their machine. Does the Mac need AV protection, as of now, probably not, because there really isn't any MacOS malware, etc out there. MacOS's could pick up Windows virus from different internet sites or emails which would just sit on the Mac computer, not able to do anything that would interfere with the Mac, but possibly could be passed on to a windows computer. I know all Windows users should have an AV program, so a Mac user shouldn't have to worry, but some people still feel safer, even if it doesn't matter
Those that want to pay for AV, it is their preference. So quit the baby stuff.