Speaking as someone who does lot of vendor evals and purchases, I would see it as a structural red flag if I see prices go up as usage goes up (for a given set of features).
Different feature slabs (basic, advanced, enterprise etc) can be priced differently.
At any given feature slab, usual expectation is that after a certain scale, additional usage will be billed close to cost. The premium you extracted at lower end of the usage slab should cover your R&D costs, other overheads and your profits.
If you care to up-sell the higher feature slabs, then you can offer a time-limited discount or trial while making it amply clear that this is a one-time discount etc. to facilitate trial.
Having a cost+ model internally and looking at your customer mix and competition in the market will help you price each feature x usage slab appropriately.
Remember that customers expect prices to always go down over a period of time (due to lowered hardware costs, better automation, depreciated/amortised overheads etc). So, it is better to start high and go low than try to do the other way.