This really gets my goat! I also think its because my face is pixelated and on AW I do not adverise my website either.
I would not mind if the request was for a face photo. But the 'Can I get a free Video look?' I find reslly rude and annoying. Especially as it is clear from mg.profile I don't offer this.
I ususlly say I don't offer Camming, as is clear from my profile. I might offer unpixelated photo..Often I don't, unless they ask.