Maybe some of you have some insight into this...what's the point of covering or obscuring serial numbers when one is listing a guitar for sale? I've seen sellers write "...serial number covered for privacy." and still others that have adamantly said "for my protection, I will not disclose the serial number." I've bought and sold a modest number of guitars over the years, and I've never bothered to cover anything, thinking that the kinds of buyers that I'd most like to do business with would be folks that would want to know the serial number anyhow. Seems like paranoia to me, and I don't get it - can someone school me on what the thought process is here?