Try to optimize your ads placements in order to improve your CTR. Try different ad units. Higher CTR will help you earn more.
Are they unique articles? 100,000 articles is a very big size, you would have to spend some like $$500,000 if you hire people to write them for you. You can't write them by yourself. Anyway, $200/month is very good compare to my $20/month. We all want to make more, so we all have to work harder to achieve that.
How much is your traffic? But with dropping CTR, I think more traffic is not necessarily going to show more improvements.
Making $200/month with 100,000 unique articles is BS. I'd be pissed as hell. I hope whoever says $200/month with 100K unique articles is good has a "real life" job. Still a bit odd; something is wrong with the story. Goodluck with the situation.
good to see an article directory making good money with adsense! Can you tell us how many uniques you are getting from the search engines daily, that would give us an idea about your traffic! also if you post your urls then you can get some specific, targeted help!
like already mentioned.. hard to say if we can't see the site... only then a proper analysis can be done. have you considered selling the site? if so let me know selling price.
LOL. Yeah, $200 is really small change. I assume the OP has relatively good traffic. With that traffic on an adult site (and not using Adsense), you might have been able to add another zero to that figure!