Lots of reasons. Once a feature has been added or a bug fixed, I'd like to tag that. Also, my point releases tend to be small, which means I shouldn't be having to add a lot of tests, which means 4-10 commits may very well be the 4-10 new tests I added and made pass.
My criteria for good software:
- Does it work?
- Can someone else come in, make a change, and be reasonably certain no bugs were introduced?