Dealing with flight availability almost daily, I can absolutely 100% confirm that BE do not intentionally overbook flights. There are, and more frequently at the moment with the E175 delays, times where an aircraft downgrade is required and therefore passengers may have to be put on other flights but this was not an intentional overbooking from day 1. This is the big difference between BE and other larger carriers.
No good anyone saying otherwise, the above is fact.