To counter this I've written a simple kludgy Pythonic solution to take my adverts and in association with cron post them into my blog once a week.
When I've debugged and cleaned this up a bit further (there's some big content assumptions right now) and made it a little easier to use I'll post it here (under GPL or Python licence probably) so that other Blogads customers can take advantage of this.
The first output from this can be seen here, I'm considering whether to have a new post every week so I can maintain a trail of adverts through time on this blog or whether just to have a single post that changes every week. I'm opting for the latter approach right now.