Steve's been on The Shopping Channel since 1992/93. So, that's nearly 15 to 16 years on tv. Time sure flies.
Anyhow, he must be doing well with The Shopping Channel, otherwise, sellers do not get invited back on to the show.
From what I've heard from dealers, The Shopping Channel takes about 35 to 50% of the selling price as commission on Steve's products.
As for the notes he sells, at least The Shopping Channel does have a money back guarantee policy, so, if you aren't satisfied by the notes' condition, return it for a full refund.