First of all, I'm really glad you answered, thank you!
Yes, I see your point: users need to be told (or at least suggested) what they can do with a digitalised drawing; but then, again, a small percentage of people would actually have it printed for themselves, which is an extra cost as well.
Yes, I've been thinking to switch (at least here on fiverr) to digital drawings. Speaking about that, I use Autodesk Sketchbook on my ipad air 3, do you think that it's fine with exporting files and such? Once again, thank you for taking time to write me!