Logos on PPT slides / logos on corporate gifts

It's the time of the year for corporate gifts. Many of these could be really nice, where it not for that huge corporate logo that makes you shelve a beautiful pencil instead of using it. A waste. If your gift is nice, you do not need to remind people that it was you who gave it to you, they will remember.
Most corporate PowerPoint templates waste a lot of screen real estate on elaborate graphics to make sure that the audience does not forget who the employer of the presenter is. This is not only a waste of space, but these graphics also disturb the overall balance of the slide. A far better way to reinforce your corporate identity is to use the corporate colors consistently through your presentation. No need for logos.
So far, a consistent message. But what if the presentation is poor, and people walk in and out of the conference room, check email, make a phone call or get a much-needed coffee? In that case, you might need a reminder of who is speaking when you re-enter the room. Maybe template designers just anticipate this situation...