In some sense, hiring engineers is like selling. In both cases, you need to convince them that you've got something that they want. Neither group cares about what you need/want.

Two related points.

If you can't "sell" an engineer, why are you sure that you can sell to your proposed customers?

While developing your pitch, be sure that you'll be happy with folks who want what you're offering. If it's not unique, you'll lose the good ones to folks who offer "more".