Have you ever been or would you consider being an anonymous sperm or egg donor? Why or why not? (See details, please)

This hasn’t been asked for awhile, so I thought I’d give it a go. A key part of this Q is the idea of anonymity, it brings a bit of a different dimension to the concept.
And all you fellas who want to comment on wearing a mask while donating in a traditional fashion, chances are your posts won’t be nearly as clever or original as you may think…just sayin’ ;-P