As a release engineer, the numbering convention of the snapshots does seem confusing to me at first. But if it works for the project, that's what's important.
And as Theo brought up, numbering them 57 snapshots doesn't fix anything. It just changes the confusion. Instead of you asking if the 56 snapshot was close to the 56 release version, we'd have someone asking if the 57 snapshot they see is close to the 57 release that won't be cut for another 4 months. The answer to both is "no, probably not". The operative word in the version is 'snapshot' and it's easier for people to simply learn that than it would be to change the project's process to create some "perfect" naming convention. Tim.