With time, and depending on the variety of strains you grind, you will find stickiness in palces that prevent smooth turning. Inside this builds up also. I brush the inside (except for pollen area) after each use... but the sticking still happens after a time.
You could be a more "tidy" grinder, or have been using herb of just the right dryness to not buld up... but sooner or later there will be built up accumulations of sticky dust in corners, and at very least around the "turning surfaces".
Any new grinder should be cleaned before you even start, to remove factory residues.
After that a newly cleaned grinder can work for me from anywhere from 2 weeks to a month before I start doing maintenance.
I use Iso around the contact sliding surfaces and kind of brush up the inside dry.
After a couple of months, that will not be enough, if I keep grinding "the good stuff", and I will need to clean it properly.
P.S.- you asked, "does that mean I don't vape as much as the next guy". It is not how much you vape... it is that you get maximum pleasure out of it every time!
It's hard to compare quantitatively, as our medication needs vary. Some enjoy it best twice a day.
I personally figure it is time to vape, if I exhale, and see no vapor!