Well, its one thing to practice on drones and staged missions, but that won't compare to when they get in the game for real and realize that there are skilled pilots who easily mop the floor with their planes and gv's. And even IF they used the two week trial, unless you're working, or have an allowance come every month, not many new people are able to come up with $15 so easily. On top of that, offline can only go so far before that person decides to go in. That's why this was placed out there, so that people who would like to learn from skilled pilots, but don't want to spend so much of their time offline, can do so.
And unless they have the 2.12 version of AH, which I'd recommend for TRUE offline practice, then I don't know what else to say.