Not sure if this applies nationwide but at the three WM stores local to me in RI, all have the proper crimping tool as well as swagging tools and allow anyone to use them, with or without supervision. Certainly makes sense to pay the small price to purchase the materials there with this as the benefit.The bench mounted crimper, was it a hammer driven one? If so, they don't make a really good crimp most of the time. The ones that look like bolt cutters do a much better and more consistent job of it.
Given the criticism WM often receives here and elsewhere, particularly in their pricing, they deserve some credit for this unique customer service.