I am planning trying to build an Authority site and will continue to update it with articles, this will be a continuous thing over next years and it's evergreen. I have noticed however that my specific keywords turn up sites with relevant articles but mostly their sites are forum based. Forums I believe are bad for adsense/CPC etc as they are repeat viewers or something am I correct? But what my main question is, if google sees 1 website with 1000 high quality original articles vs 1 website with 200 high quality articles but with 500,000 forum posts, will the fact they have a forum be negative or will it index forums just like it would original articles? I know it's not as simple as that but I'm just wondering is forum worth the effort, I had one before in different niche with 4000 members and it's a lot of extra work.