[magicalhippo]

We have lots of small companies with 1-3 employees sending a handful of messages a month, to big multi-national corporations sending many thousands of messages a day.

For the big companies we're typically a crucial part of their business and they typically require several integrations and other specialized modules which have upkeep. So we charge a bit more for the software. On the other hand, they typically have a very high message volume so they get a decent message volume discount.

For smaller companies the software is typically a bit cheaper, but with a significantly higher per-message cost.

Then of course there's negotiation for each contract which would make "web prices" rather moot anyway. Maybe a company wants lower fixed cost but can accept a higher per-message cost, as messages are often directly linked to their revenue, or vice versa.