In the past there have been discussions for different cost of PUT, where public data costs less than private data. This has been challenged due to the fact that it can be gamed easily (i.e. encrypting your files before uploading them publicly). I´m very much against a general discount but I believe that there is at least some reason for public data being less expensive than private data and I wanted to invite you to comment on it, because I´m unsure whether the conclusion makes sense or not.
In an older topic @dirvine was asked whether one could game the farming reward by creating an app that creates GET requests for chunks that are stored in the own vault. David answered that it is yet to be decided how many GET request will create one Safecoin, but he made clear that it will be an immense amount and nearly impossible to do it on your own.
Assumed that private data cannot or at least is not meant to get viral (because that´s precisely the reason why it is private) the avarage reward is expected to be considerably lower. For the farmer and the network in general it´s better if files are used, because then they can work and receive payouts. In a flat price model (private & public data cost the same) the cost for the more expensive private data is subsidized. On the flipside, if public data costs generally less, it can and will get exploited.
In a way I believe that the idea that public data costs 1/4 of private data relies on the problem that private data is more expensive for farmers. The solution however to set an overall discount doesn´t sound economically feasible to me, because it does not relate to actual user behaviour within the system.
I wondered if the problem could be solved if vaults are allowed choose how much space they want to allocate for private private. In this case there would not just be space scarcity but two types of space scarcity resulting in different prices for public and private data. While this can still be exploited, in comparison to the fixed 25% discount the market would react to it immediately and higher or lower prices.
What do you think?