No, not crazy, But be aware that *every body* at a Ren Faire thinks they can do leather work cheaper and better than you (at least thats my experience)
Also, I found all I needed was a small fold up table, a stool and a cloth about 3ft x 3ft. Table for better things, eg my board games, the cloth on the ground for general belts and belt purses & pouches, drawstring bags (which are easy to make and really big sellers)
Just before I gave the medieval scene I was trying to make a good version of a