>Web apps shops (online-only, no piracy there) and mobile apps shops (where piracy has a much, much higher barrier of entry and is comparatively non-existant).

Well thank goodness you're here to solve all the world's ills! Believe it or not, there are still significant numbers of people that either aren't connected or use software in a situation where they're not connected to the net. That totally screws the usefulness of webapps.