Snap on wheel balancer

My shop got a new wheel balancer from snap on +$4k. AFTER buying it they told us we also need to buy a plate and pin mounting set that costs another +$4k. It came with the cones for the center hub mounting for standard rims. How important\necessary is that pin plate and pin set? We did find an alternative parts place where we could get the plates and pins for about $1.5k but I just don't know if that's even needed.