US Patent and Trademark Office has a list of complaints against IP & R Inventors' Publishing & Research by inventors that were cheated out of their money.
Take a look for yourself:
http://www.uspto.gov/web/offices/com/iip/c...pr_medeiros.htm
http://www.uspto.gov/web/offices/com/iip/c...8/ipr_jones.htm
http://www.uspto.gov/web/offices/com/iip/c...08/ipr_geer.htm
http://www.uspto.gov/web/offices/com/iip/c...ipr-mckenna.htm
http://www.uspto.gov/web/offices/com/iip/c...ipr-davison.htm

For a more information on complaints for other Invention marketing companies go to:
http://www.uspto.gov/web/offices/com/iip/complaints.htm