I wouldn't buy them as an investment either. I did buy an uncirculated today though, just because I'm a fan of Twain.
The baseball one is the only gold commemorative I can even think of off the top of my head that actually sold out.
The same use of the definite article "The" in front of the correct title, "Adventures of Huckleberry Finn" occurred with the issuing of a block of four 29-cent postage stamps for Youth Classics in 1993.