For many DACs, it would be beneficial to have a built in ratings system to establish reliable reputation. I propose that share transfer transactions allow the inclusion of additional transaction fee to purchase storage space in the blockchain exclusively reserved for a review of the receiver's performance by the sender.
Basically in addition to the standard transaction signatures by the sending addresses, an additional signature could be added from a DPOS registered name, attaching the transaction to that pseudonym ID and claiming the right to leave a review transaction signed by the chain registered ID after the business was concluded.
The reviews would have a different standard format specific to the needs of each chain's business model, and would persist in the chain tied to the reviewed ID.
Along with providing an indelible rating system, which increases the value of the platform, this would provide incentive for additional transaction fees, increasing dividends to shareholders. Service providers would be motivated to provide discounts to those willing to review in order to build their reputations, and reviewers would not want to sacrifice their own reputations by providing fake reviews, or by failing to review after opting for review space in a payment.
I'd like to hear thoughts on both the economic model and the plausibility of implementing this with DPOS. The biggest issue I see is finding a price for permanent blockchain storage space.