Why should be witnesses concerned about price? That is not their job, nor it is their job to look into DHF spending. Their only job is to secure the blockchain.

All of the things you list here are the job of stakeholders, not the witnesses.

While some of the top 20 witnesses are massive stakeholders, some of them are not.

And I see this as the problem with people crying witnesses that witnesses this. Price, other than relaying it, is immaterial to a witness. They don't have a mandate to increase the price, their only mandate is to secure the blockchain.

You and I are not majority stakeholders, and we are moving on the whims of those majority stakeholders. That is the reality of a minority stakeholder, in any configuration of stake.