Is $500/mo the right price for a web-hosted POS?

We are thinking about offering our POS bits as a managed-hosted offering for smaller retailers, trying to feel out the pricing.

Our small team has been at this a while; on the supply side (since 2014). We've done some (self-hosted) deployements of our POS but don't really have it as part of our managed-hosted offering. Maybe?

It's a pretty plain system: scan the inventory, take the cash, print receipt. It's got minimal feature-set compared to $THE_BIG_ONES_WE_ALL_KNOW.

We don't (yet) have any integration with Weedmaps, or payment-networks, or -- what else?

What's the need-to-have functionality? What's the nice-to-have features?