Crispy_Frog

I've been playing with quilting for 13 years and over the years have discarded pins for feeling dull. I run them through the little strawberry emery pin cushion to "sharpen" them, but that doesn't seem to help. I'm getting frustrated by the amount of pins that suddenly seem dull. I primarily have the yellow-top pins. Should I invest more in pins? Is there a preferred brand that stays sharp?

Any suggestions?