[Poll] Yearly Service Cost for all transactions fees from 1 million addresses?

Hello to all,

So i'm trying to figure out how much would someone (individual/organization/company) value a yearly, renewable, service that allows them to manage 1 million unique addresses.
This someone can provide all additional services it wants besides the normal transactions that each person can already perform.
And it can set and receive in their entirety, all of the fees associated to transactions involving those addresses (either between them or with external addresses).
In exchange it has to provide a node through which all the transactions created by the managed addresses are relayed to the network.

So i was wondering how much do you think such service could be worth with a currency of the dimension of Bitcoin or Ethereum and where such thing could be possible.

Some assumptions:
• no fees go the miners and there are no block rewards, all transactions are registered regardless;
• addresses can still be created by individuals or controlled and provided by you (like with websites that offer wallets/accounts);
• people cannot bypass you to avoid your fees.

To give a little perspective with Bitcoin, based on blockchain.info charts, there are less 300 million unique addresses.
And this last year 9.3 million USD were paid as fees without block rewards, which results in $30k/million/year.
With rewards, total paid fees reach 563 million USD, which results in $1.9million/million/year.

Thanks for your responses

Edit: An analogy would be, developing a Wallet with all the services you want, but limited to 1million users/key pairs (known only to your clients), and in exchange you receive all transaction fees associated, as it is used by your clients.