I do offer my clients that allow me to advertise a discount on other items they may need - be it printed materials or a discount on their maintenance. I certainly give the option. Most of the bigger companies have IT departments and handle their website internally - which is why there isn't a name on the bottom. I figure it is up the person who owns the site. I am a hired contractor - here purely to provide a service. If I am allowed to advertise, great, if not, it's in the code anyway. No harm, no foul - either way.