PMP in 21 Days | Based on PMBOK 6

I was in a PMP workshop (PMP Preparation). It was for an organisation and in-house. Good, matured project managers from various streams including finance, operations and training domain were in the room. This was Day 1. People were all tensed up, and you could sense the tension in the atmosphere. I started with joke and a few activities before lunch and slowly people got relaxed. The next day - again same environment, the folks went back and opened PMBOK and felt very nervous and hence the anxiety in environment. Someone asked "Why should I sit for the examination - what are the advantages of being a PMP"?  Is this a question for Day 2?? I wanted to ask, "You tell me why are you in this workshop - what made you decide to spend your money and be part of this session?" But I guess that was just the anxiety speaking. The same person on Day 4 (Last day) came back and said : "I went through PMBOK and I felt like I can read this book and understand t...