The point in the site substituting the A within the word with an @ is so that when they are being discussed the adverts displayed on the site will be not offering said items for sale.
What genius came up with that idea ?
Just like spammers getting around people's simplistic word filters, some marketing guru will add in the word l@ser to their keywords and hey presto.
I'm not saying it will happen immediatley or tomorrow .... but sooner or later, it will !