As an Internet Marketing Consultant, I am often asked why Google recommends videos after the video you are viewing. My answer to this question could only be speculative as no one really knows the reasoning behind Google's decisions, but one good possibility is to keep you watching and keep you on their site to view more advertisements.
Google tries to find videos which are in the same genre as the video you just watched, which can sometimes lead to suggested videos from your competitors. This is obviously an issue for most, as you have created these videos to increase end-user confidence and to increase the likelihood that they will contact you for your services, not your competitor's services.
This brings us to the next logical question I hear, "Can I remove Google's recommended videos?" Fortunately the answer is yes, and it only takes a few minutes.
How to Remove the Recommended Videos from YouTube:
1) Go to the embed code which is pulling in your video from Google. If you are viewing the video on your website from the back-end of your CMS, you will probably have to view the "Source" or "HTML" view rather than the default view. This can be seen at the top of your page-editing toolbar.
2) The code should look something like this - <iframe width="560" height="315" src="http://www.youtube.com/embed/tqUqqkw7iSI" frameborder="0" allowfullscreen></iframe>
This code tells your website which video to pull from YouTube, as well as the size of the video.
3) To remove the recommended videos, simply add the following code ?wmode=opaque&rel=0 to the end of the link to the video, directly before the closing quote which has the YouTube link.
4) Your revised code should look something like this -
<iframe src="http://www.youtube.com/embed/tqUqqkw7iSI?wmode=opaque&rel=0" frameborder="0" width="560" height="315">
5) Double-check your new embed code to ensure that it has been installed correctly and has removed the suggested videos once the video has completed playing.