I am one of those folks at SVRy that has on numerous occasions put my tools down to greet a visitor and take them on a walking tour of the yard and perhaps to the shop so they can see both engines. I am a volunteer, so there is no issue with interupting what I am getting paid to do in order to be a tour guide. I and just about anyone here that I can think of is glad to see visitors and show them around. It has happened not infrequently that the person that get's the grand tour, comes back to volunteer at some point. That is in part how I got involved. I can recall one Sunday where we has a sucession of visitors and had a project that we were trying to complete. As I recall, we kinda traded off between 3 of the three of us that were working giving the tour.
As a business man I can say without doubt however, that if I was paying employees in a shop, I'd much prefer (INSIST ON) to schedule tours for visitors at times that wouldn't interupt the work going on using a guide that is paid min. wage. Consider for a minute, if you have a shop with 5 employees working. A tour group comes in and interupts the employees for say just 5 minutes. Let's say they are all journeyman level employees making $18 per hour, turning out work that you are charging a customer $40 per hour for. That 5 minute interuption was equivalent to $7.50 in wasted wages, and over $16 in end productivity. Times this by several such interuptions times the number of working days in the year and it's a big deal!