Let's ignore the Lightning Network for a moment, and dig into the meat of what you're suggesting: that people—in some meaningnful number—would prefer to spend money to get a thing they currently get for free (with the caveat that they occasionally they have to listen to / watch advertisements). Maybe you're right! But: 1. I doubt it. And 2. Lightning Network isn't the only technological solution to such an idea. This concept isn't particularly common, probably, because most people will put up with a lot to avoid spending actual money.
