I Was Told Either You Graese It Everyday Or Dont At All. . .
+1
If you take apart an old nose sprocket, or find a good diagram, it helps to see what's going on with the sprocket and the cylindrical bearings in there, which need to be lubricated.
If you shoot grease in there through the pin hole regularly, the bearings stay greased. If you never grease the bearings, the bar and chain oil will work it's way in there (between the sprocket and the inside walls of the bar) and lube the bearings.
HOWEVER, if you grease the nose sprocket infrequently, the residual grease and sawdust combine to form a dam that keeps the bar and chain oil from reaching the bearings.
So do it, or don't do it, but don't sometimes do it.
If you have a bar that you have been greasing, or pick up a used one, you can clean out the residual grease with a toothpick followed by some solvent. If a blast of compressed air sends the sprocket spinning, you probably have most of the grease out of there.
Philbert