I don’t know if anyone has experienced this, but I would like to know if you have.
We regularly do searches in Google and other search engines on our plugin names in order to see what comes up.
It has always been nice to see that links from any of the marketplaces (in our case codecanyon) always came out as no. 1 or at least 2-3, when searching for the plugin name. 
A few days ago we discovered that the codecanyon link for one of our most popular plugins has been “bumped” down to page 2 on Google. Our own demo site is 3-4, and above are sites that i don’t want to mention, but you know what I mean.
We have tried this with all 17 of our plugins and pretty much ALL of them rank 1 or 2 on Google when you search for the plugin name, however this very popular plugin has been “dumped” to page 2 
Did Google punish Codecanyon in this case? Or did they punish our plugin name? 

But … I always get the feeling that if we’re not amongst the first 3-4-5 links …. And second page … it’s the same as 56th 