Dramatical drop of CTR - Interesting problem!

[advantage]

I have two almost identical music sites:
www.musictodownload.eu
www.freemusictodownload.eu

They always have had very similar AdSense CTR and Revenues.

Few weeks ago I started to exchange links. I have been offering adding link on www.musictodownload.eu (in Links) in turn of placing link to my other site www.freemusictodownload.eu.

Since I have been doing it, I have noticed dramatically drop of my CTR for www.musictodownload.eu. It was earlier about [double-digit figure]% and now (for few weeks) is about [low single-digit figure]%. Of course I have more impressions for www.freemusictodownload.eu and almost the same CTR as earlier.

Why have dropped my CTR for www.musictodownload.eu? Could you help me?

Thank you!

 

[SamOwen]

Maybe because people are clicking on those new links that lead away from your site instead of stayig on your site and clicking the ads ?