I have about 2 1/2 sets of sheets and a few extra mattress covers, but just one set of blankets and comforters.  I don't think I'd have storage space for extra blankets and comforters -- I have 10 beds and closet space is at a premium.  If I had to replace a blanket or comforter, I guess I'd take a quick trip to the store during my changeover time.  

It never occurred to me that guests would complain if a bedspread changed!  My goodness, would they prefer us to leave a stained or soiled one instead of replacing it with a fresh new one?  As long as the quality is the same or better, surely that is good enough.

We have two properties with 2 King and 3 Queen beds that we have been renting for over 5 years.  We have 2 spare sets of sheets/duvet covers for each bed so that our gem of a housekeeper can accomplish a four hour turnaround, and one spare comforter, blanket and sheet set (plus pillows) for each size bed in our owners closet.  We use duvet covers on all of the beds, especially for guests that bring pets because we are aware that no matter what our contract says about pets and the furnishings, pet owners often sleep with their pets.  When I take a bedding set out of the rotation and add a new one, I always take a picture of the newest bedding and post it.  But that does mean that what is pictured is not necessarily on the bed when the guests arrive.  So in my reservation contract, which the guest receives prior to putting down their money, I have a clause that states that the linens provided may be different from those pictured, but will be of the same brand and quality.  Only once have I had a guest call because the comforter was not the one in the picture!  Fortunately, I had her look inside the duvet cover and the expected comforter was inside.