It probably has more to do with the size of the coin rather than its subject. Those new quarters--easily confused with nickels--aren't especially popular either.Both the Susan B. Anthony and the Sacagawea dollar coins were pretty much flops and a big disappointments. The two depicted on those coins didn't have much of a following. There seems to be a faction of our population that is desperate for heros and another part that of our population that is more than willing supply them. Tubman has a following and it just may succeed this time. Why not the one dollar coins?