Hi Mike,
Thanks for your response. I really appreciate your honesty. The last thing I’d want to do is hoist something on really annoying on the world, and this type of feedback is instrumental in figuring that out.
I do have a couple of responses, but please don’t think I’m dismissing your opinion (I’m definitely taking it into account);
> The fact is that I personally find this sort of thing intensely irritating.
I can see that. There would definitely be a group of people who feel this way (I don’t know at the moment how big that group would be). Personally I’m pretty neutral towards this kind of advertising. For example, when I’m using YouTube and I have to wait through an entire ad at the start (20 secs or more) that annoys me. On the other hand if I can dismiss the ad after 5 seconds or so I don’t mind it so much. I’d rather that than have ads during the video.
> It would also detract from the sites that I am linking to
There’s some truth there, and it’s something that concerns me, but at the same time, you’re giving them the link 
> If the ad only appears for a few seconds, the advertiser only has that amount of time to catch the viewer’s attention, give him time to read the ad, and then let him go ahead and click.
I think if advertisers were using a CPM model that’s true, and I’d only use that model if they were fully aware of how it would work. At least at first I’d go for a CPA or CPC model, so they wouldn’t be damaged by the ad only being shown for a limited time.
> can imagine many visitors being frustrated because they are actually interested in the ad, only to see it disappear before they have a chance to react.
I can see that too. Perhaps an approach more like YouTube would be better, i.e. “You can skip this ad in x secs”. On the other hand as the user I wouldn’t want to have to click again from an ergonomic point of view. This is stuff I’d experiment with, but I wouldn’t allow test cases that cross the line of being truly irritating. That’s something I’m acutely aware of with this idea.
Thanks again. All good stuff. It’s by no means certain I’m going to pursue this. Good to know this stuff before spending any time on implementation 