I realize that the account offering this service will receive many undeserved negative trust ratings. This is simply the cost of doing business. The trusted account, and the accounts being sold, will be unaffected. Would your leaving negative trust on this account be the full extent of your response?
I guess sooner or later people would find out what account gives or "lends" those trust ratings, and that account would be removed from DefaulTrust. Which would in turn undermine your business, leaving your service without any real value.
I doubt that it's a viable business model, but you're absolutely free to try, IMHO.