You're missing the point. $20 is a steal, but the price is irrelevant. No matter what the price is, it's bad business practice to say "Here's a demo of what you

You're missing the point. $20 is a steal, but the price is irrelevant. No matter what the price is, it's bad business practice to say "Here's a demo of what you're getting for $X" but then deliver something different that only works as advertised some of the time. It's like presenting an Altair at a conference and letting people play with it. But when they buy it, they get something different, or realize that the Altair presented at the conference was actually just a trick that works a fraction of the time.