Why was Huck disappointed over the story of Moses?

Huck was disappointed because Moses was long dead...... and he "took no stock in dead people."

After supper she got out her book and learned me about Moses and the Bulrushers, and I was in a sweat to find out all about him; but by and by she let it out that Moses had been dead a considerable long time; so then I didn't care no more about him, because I don't take no stock in dead people.