Sampling scopes meet a lot more of the use cases for high bandwidth scopes (eye diagrams, jitter analysis, etc.) because they were going to be building up intensity or color graded diagrams and statistical analyses from many acquisitions anyways, but the big benefit here and otherwise is price. Only your frontend needs to operate at the full rated bandwidth, and the price here reflects that - only $20k USD for a 4 channel, 16GHz bandwidth scope is only just a realistic price for a similar realtime scope on the used market, and is probably 1/4 to 1/5 the price of your cheapest realtime options on the new market.