From the Marriott Rewards Terms and Conditions (emphasis mine):
"3. Benefits of Elite Membership are reserved for Members only and apply only to the one guest room in which the Elite Member is staying.
10. The Company reserve the right to revoke, cancel or suspend a Member's elite membership status (including Lifetime Silver, Lifetime Gold and Lifetime Platinum status), any Rewards Program Membership, Reward, and/or any and all unredeemed Points or Miles, or take other action at its discretion, at any time with immediate effect and without written notice, if Company believes the Member has (1) violated any of the Program Rules..."
Source:
http://www.marriott.com/rewards/terms/elite.mi
If I had violated the rules, the last thing I'd do would be to demand anything. Maybe that's just me.