Rather than all the services being priced relatively the same, rate-tiering should be offered so that very expensive services, like same-day delivery or one-day delivery, would have a premium. However, you need to have the flip side, where slower services are your economy service. The challenge there is to also have tracking, but I think that creating those tiers and pricing things in that way makes sense.
On October 31st, 2016. See this statement in context.