How do you incentivize high throughput of data?
Do you mean for storage or retrieval?
For storage the client can just stop transferring to blow the deal up if the throughput is too low. We imagine there will be reputation as well, and I can easily imagine the client library having statistics that are made available somewhere.
For retrieval the current idea is that the miner gets paid incrementally as they send the data so the faster you send the data the faster you get paid (and not some other miner that the client might switch to or have opened in parallel).