Honestly, I do this all the time and really see nothing wrong with it. Our point of view on these forums is that most Rewards members are business travelers, and that may be true. But many, many of my Marriott stays are as a family and we initially signed up for Marriott Rewards because of personal stays, not business stays. To me, we travel together and earn points together.

I did put my name on my husbands Marriott account over two years ago. To this day, I have never received any document, membership card, statement or mailing that indicates I am on this account.

When checking into a Marriott without my husband, I usually take his Platinum card with me. Usually, if I am occupying the room alone, I will call ahead and state that, and get the room changed to my name, still under our account number. On other occasions, if they ask if Mr. Flyerwife is here, I'll tell them that he is checking in late. Never encountered any problems with this. In fact, I always am given Concierge access, Platinum gift, and almost always an upgrade or suite.