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If your tgp's are all interlinked, google may look at them as a network of websites set up to artificially inflate link popularity and page rank. If so, it will penalize them all by burying them in the serps. In this instance, you may keep your page rank but your rankings will fall. Getting them back is a long, tedious process. I've yet to see a re-inclusion request work in such a case. If you have them all pointing to some of your bigger money making sites you may want to consider pulling some of those links. Matt Cutts even said (I don't have that quote at hand but I remember reading it) that Google will even look at whois info to see what other sites you own thinking that if you're using blackhat techniques on some, you may use them on all.
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