#1 - It's a business card. People might want to remember who gave a talk at some point in the future. #2 - In many cases, I've recorded or found a video of the

#1 - It's a business card. People might want to remember who gave a talk at some point in the future. #2 - In many cases, I've recorded or found a video of the presentation. Having the slides allows me to go back through once more.