I've looked more closely and it seems that for forum supporters the adverts are gone when reading the individual forum, but there is still a BIG one there if reading by 'Today's Posts' or 'New Posts'
Not sure if this is intentional or not. They were everywhere last week and have reduced now, but still more than supporters used to have (previously forum supporters only had the ones at the top and the forum sponsors ones.
I know there are adverts between threads/posts for those who are not supporters. Marty has to raise money to run the servers which such a busy forum need high bandwidth and processing and that costs more than a less active forum would cost. I know forum supporters get less (definitely none between posts within a thread) because of the contribution we have made to the costs.
I thought there had always had been ones like Nenella shows, when I didn't log in. I can't be certain though.