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I'm not sure if the search engines penalize from the IP address or from submitting too many pages that belong to a specific domain.
Most web sites (one of our divisions is a host), and I mean truly most, are on shared server, and the IP address can be the same for 10 to 15 sites, easily. Submitting 5 to 10 pages for each of those sites could generate 50 to 150 hits from the same IP.