When a geek fixes a friend's computer, there might be a difference of opinion on the standard procedure. For example, the non-geek might picture the interaction like this:
Step 1. Notice broken computer.
Step 2. Call geek.
Step 3. Geek fixes computer.
Step 4. Repeat as required.
The geek is likely to include an extra step that I'll call "3.5" to slot into the correct position:
Step 3.5. Explain the cause of the problem so that it can be avoided in future.
This is the kind of payment we expect for our help. Not so that Muggles will be in awe of our skills, but so we can both avoid the hassle from then on.
Mokalus of Borg
PS - Some problems are a bit too weird to explain, though.
PPS - But those ones are less likely to be fixed this way.