If your concept has hockey stick potential then build an advisory board, recruit investors and hire the talent you need.
   Asking someone to perform work for equity only imposes a cost on the talent - the cost of foregoing earnings talent could be bringing in now. Add that cost to the risk of the equity coming in far below expectations because of factors talent can't control (maybe the company sucks in management or sales) and you can see why your offer is singularly unattractive.
   Prospective investors will also be uncomfortable with this because of the likely low quality of the talent attracted to an equity only proposition and because of dilution.