No offense to the OP, but I would never purchase/trade anything unless I saw a photo *with* a date and your username in it. For users selling rare items, especial new users that claim to have lots of items, most people would want to see photos to verify that: A) You have what you say you have, B) You didn't just lift the image from another well known collector, C) The condition of the item is accurate.
If this were someone like ProfessorProfessorson, Necromancer, or any of the regular faces we see here, I wouldn't care as much. But considering this is coming from someone with < 10 posts, you'll excuse everyone for being a little cautious.