From the DVCmember website it looks like Michigan is not eligible for the $200 referral reward
"Eligible Jurisdiction" refers to any jurisdiction that permits its residents to participate in the Program. Current Eligible Jurisdictions are: Alabama, Arizona, California, Colorado, Connecticut, Delaware, District of Columbia, Florida, Georgia, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Mississippi, Missouri, Nevada, New Hampshire, New Jersey, New Mexico, New York, North Carolina, North Dakota, Ohio, Oklahoma, Pennsylvania, Puerto Rico, Rhode Island, South Carolina, South Dakota, Utah, Virginia, Washington, West Virginia, Wyoming, and Wisconsin. DVD reserves the right to add or remove Eligible Jurisdictions as business and/or jurisdictional changes require. The Program is not available in any jurisdiction in which the offering or availability of the Program is prohibited by applicable law.