Agents wouldn't be intermediaries, but ticket processors (miners) . . a regular player could mine his own block and keep the commission, or go to a processing(mining) pool that was offering 10% cash back.
I do not know where the problem is FreeTrade, but there is something terribly wrong if you need 15% for the miners in order for your DAC to work…
I will stop short of accusations for something suspicious in your intent, but at least something not thought over in the general economic model.
[Edit] When I first heard about your DAC I thought you need the 15% at the beginning, just in case there are some top prizes early in the DAC’s life, and you do not want to increase the # of shares in such outcome. And expected you to lower the house cut it in due time.
I also bought some MMC as it was the best way to get some shares. Now my MMC investment is liquidated (with only 3-4% loss). I will get the shares from the AGS and PTS in my wallets (as they are virtually free), but will definitely not bother transferring my PTS from the exchanges, as this DAC is frankly not worth it, in the form suggested.