^You're both right. Linux can get viruses, but considering it's built-in security, as opposed to Windows, that with many of the extremely few viruses there are you'd have to deliberately spread them in the system as root before they could work. At any rate, they're still so scarce that you're more likely to win the lottery than get a Linux viruses (no joke).
Personally, the almost entire lack of viruses was one of the things that attracted me to Linux in the first place. Maybe some newbies would still cling to antivirus software like a kid to his blanket, but many wouldn't - until they saw something like that. Then they might think they'd heard wrong and had better get an antivirus program after all, and that's exactly what those ads are designed to do.
I thought about posting at their forum in the guest area, and maybe I should have. But would I have gotten an honest answer? I wasn't so sure. After all, if they would do such a thing in the first place, would they have answered me honestly?
Lastly, just one more thing for the record, in my first post, I meant free as in unrestricted, not cost. Free software by the open source definition can't be taken back, and a great deal of the programs they're selling are open source.