Why do they need to recycle serial numbers? There are still so many numbers available to use if they just start assigning some new printer letters in the front. As a side note, can anyone explain the apparent randomness behind their prefix selection. I can understand not wanting to use "I" because it represents "1", but why print EZI and then skip ELI? Furthermore, if it's okay to use "I", what's the problem with "Q"?