I organise conferences as a hobby, and I've been manually doing mail merge on badges for the past few years. It takes me anywhere between 5–15 minutes to set t

I organise conferences as a hobby, and I've been manually doing mail merge on badges for the past few years. It takes me anywhere between 5–15 minutes to set things up, and my biggest annoyance throughout the process is dealing with CSV character encodings. I think the main value the service provides is that it provides "guaranteed" next-day delivery. My print shop gives me a fair amount of crap for not sending my badges to print a few days in advance. On the other hand, it's so much less work for organisers to print blank white boxes, and let attendees fill in their own preferred names at check-in.