I'm guessing I'm not the only one who carefully chooses editions for my classes, and then has students show up with e-texts that aren't the same edition, and that are usually 19th century editions with no editorial apparatus at all, n page numbers, line numbers, nada. Or, when they're a bit more textually savvy, students ask if they can use this e-text they found for free.
I finally wrote a note to my students this semester explaining that while they can choose other texts, I choose the editions I choose based on balancing cost, editorial and textual quality (glossing, notes, textual information, margin space for notes, etc.).
I somehow doubt this is actually going to resolve the issue because what students really want to hear is that yes, the free e-text they found is an excellent alternative. But so far, in my experience, it's not.
How do you folks who deal with older texts deal with the question?