As others have said, it's cool that the website is getting some cash in (especially since, as others have noted, adverts have been a bit rarer of late - I recall someone commenting ina nother thread that they took their advert out of circulation becuase it was the only one going and they were getting fed up of using their own impressions ;-) ) and it's good that Wizards are advertising here. And, since I let my community supporter account lapse a bit ago, I probably shouldn't be whinging anyway. ;-)
What's not cool, though, is squishing every page and losing a good 6cm of screen space to insert an extra ad; especially when the same product is being advertised up the top. I know it's cash and all, but I seem to recall a Wizards ad causing problems before: didn't they have a too-long banner ad for a short story collection a couple of years ago? I remember that messing up the way I viewed the page, at least.
If it's short term and it's somewhat essentially cash, then I guess I can't complain: to be honest, I haven't been about the site as much as I used to of late anyway, so it wouldn't bug me as much as it would have a year ago. But it makes every page of the website look weird to tell me to buy something everyone here is either already gonna have, already gonna want to get or has decided not to bother with - so, community supporter or not, I feel a small whinge is in order. ;-)