I know I'd rather send in a cheque once a term and know it was going to be dealt with for me.
The foreseeable problem is that, if the business model were successful, anyone who didn't buy the cheapest possible ingredients would be easy to outcompete.
And at least I know my daughter is using good ingredients when I provide them.
Her cake was, by the way...er...dense. But don't tell her I said so... :)