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>>>Happens all the time and I've never seen it do any harm
But you're seeing the end result and not the methods, planning, other links, site topics, etc that could be attributing to the site's success with the method.
Google will definitely treat this link exchange with suspicion and may devalue all the links as all the sites are on the same IP address. Its like a link network.
I had site wide links on over 32 client sites to my site. I got nervous fearing this might result in a penalty from Google because most of them are on the same host, but different IPs, so I took them all down except for 1 link on each home page about 4 weeks ago.
My backlinks dropped but my traffic has steadily increased to 10% above when I took off the links. This could be the result of seasonal changes as my site traffic rises and falls with the school year so I'm not sure if that was due to removing the links or not but it hasn't hurt any.
In the past and uptill now, I don't think that will have any negative effect on your sites, but what would you do if the SE decides to turn its knob in the future? Let's say in a year or two. Considering that there are many good web hostings at reasonable prices nowaday, I don't think putting all the 10 sites on the same shared hosting is a good long-term plan.