Even more than some of the other answers, I'd ask you to consider how much you believe your idea is worth. If it's substantial then do you really want to sign over 30-50% of the future profit in exchange for your technology? And if its anything other than a substantial amount of equity for a high-probability high-profit venture, why expect someone with critical skills to sign on to the project?

Even with 12-18 months of runway at 80% market salaries you'll probably have to offer some moderate equity to entice someone to take on the risk, hours, and uncertainty of a startup compared to a solid professional gig.