Absolutely a feature, interactions have to have some weight in order to express quality. Broadcasting data should cost as much as the energy and tools required for the relays to work, so I would add a cost to every interaction that leaves a footprint on nostr.

I would also add a premium to filter "low cost" interactions.

For examples, If I post something I can decide whether to see or not to see comments posted under a 5 sats commission in order to bypass bot or other low signal comments.

I would also have the possibility to broadcast to specific relays with higher costs if they assure high quality content and specific content.

I would also have the possibility to boost post in order to make them more visible, or to avoid relays to delete them if they need to clean space for new or different things.