Mark,

If one of the parts of the museum's mission is to encourage people to take art
home with them, to have resources for more fully experiencing their world, and
being able to extend the museum learning experience, your store is an integral
part of the museum.  Further, if well done, it will both attract people to the
museum AND help pay the bills.  Don't worry about commercialism - you are
fulfillng your mission.

Mac West
Informal Science, Inc.