S!=aS. I can't think of many instances where I'd pay a recurring fee for the use of a piece of code. Code to me is an end-product, meaning, I buy it then I own it in perpetuity. I still have my copy of XP from the Paleozoic era but it's still mine and if I choose, I could spin it up. I can only think of two instances where I'd agree S[is]aS; signing up for a full class, and buying tickets. I thought both of these were clever ideas but I'd still be hard pressed to agree to pay anybody else for this "service."

That said, hat's off to those of you who make this work.