What does the employee imply about the workshop’s registration fee?

Listen to a conversation between a student (S) and a university employee (E).
S: Wow! Your store isn’t too easy to find.
E: You can say that. They’ve moved us to the basement.
S: Well, I made it anyway. Could I get some color copies of this flier?
E: Sure, how many do you need?
S: 500. It’s for a fundraiser I’m organizing, and I need enough copies for each faculty and staff member, also a few to put on bulletin boards.
E: Really? What fundraiser?
S: Oh, it’s to raise money for a new sandbox at the preschool on campus.
E: Oh, do you work there? My wife and I looked into the preschool for our daughter, but we arrived on campus too late for her to enroll. I just started at the university this semester, so maybe we’ll get her in next year.
S: No, not exactly. I’m majoring in early childhood education. For a research paper I’ve been spending time there observing the different ways they teach pre-reading skills. I was really surprised by all the learning tools and techniques that they use in the classroom and even on the playground.
E: Yea? It’s interesting what they do with kids these days.
S: Anyway, there’s another thing that surprised me. I had no idea how sparse their playground is— just a slide, some balls, and a couple of swings for about 45 children! The director told me she’d love to have a big sandbox too, which got me some thinking. I have to do 20 hours of community service to graduate, so I offered to organize a fundraiser to buy a sandbox, and the director really loved that idea. I figured that’ll take 20 hours, at least.
E: So what’s your plan to raise the money?
S: I got my advisor, Professor Campbell, to teach a parenting workshop there. He’s going to give tips on raising toddlers.
E: Great idea. Toddlers can be a challenge. I know that from experience.
S: Anyway, the workshop is just three weeks away, so I need to distribute the flyers as soon as possible. Could I get the color copies right now?
E: Well, unfortunately our color copiers are undergoing routine maintenance right now, so it might take a day or two, but if you need them right away, you could use one of our black and white copiers. They’re all self-service.
S: I guess that’ll be ok. Thanks!
E: By the way, how much are you going to charge for that workshop?
S: $50, but that registration fee also includes a copy of Professor Campbell’s new parenting book. He wrote this great book about toddlers that sells for $25.
E: $50 seems a little high, but since you include the book too...
S: Yea, the book has gotten some great reviews, too.
E: Hmm... can I have one of your flyers after you make the copies?
S: Sure! I’ll give you a few if you want to help me spread the word.