This sense I have of the value of my comics on comiXology is partly related to that service's use of DRM to regulate the who, what and
where of access to
purchases, but I also think that, in most
everyday contexts, digital media inherently carry a different sense of value
for users.
Keep it in a savings or checking account (or your underwear drawer),
where you won't be tempted to spend it on
everyday purchases, but
where you know it will be
for when you have that emergency (a broken TV doesn't count as an emergency).