It's a common quandary Nick, this business of signing or not signing a print. Limited Edition prints may have some merit in direct-to-mat signings, but I'm not convinced enough to do it. I sign on the back or on the Certificate of Authenticity that accompanies each print, framed or just matted.
I scanned one and only one signature about 14 years ago that still goes on all my titles. Ever the Artful Dodger, there are of course others: 6 other signatures, 3 different names (nom-de-plumes), heaps of forum names, 2 genders and several unusual qualifications additional to Photography. Your guess is as good as mine who you're dealing with tonight, honey, LOL!!!