I think it's best to be honest about linking to your own sites. I don't think you will get penalized so long as you are honest about it being your 'network'. For example, I doubt if Google penalizes PornHub for linking to RedTube etc. Also if they are sufficient quality. The reason why 'Private Blog Networks' got downgraded by Google was because the standard practice was having lots of your own spammy sites linking to your breadwinner site.
I have a related question - if you have several or more sites on one webhost, in order to save disk space, is it a good idea to embed a video from one of your sites on your other sites, rather than having to upload the same video multiple times? And how do you link to the video path - through the domain of your site that it is hosted on, or the server directory path?
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