Essentially, when encouraging a techie to give up a well-paying job, you will have to convince him/her that they have a better chance of creating wealth as your business partner than as an employee.
Logically, what techies will be seeking from non-technical co-founders are the aspects of business that they may not have an interest in, or may not have the experience or competence in. E.g. understanding of domain, understanding of fundamentals of business, sales skills, operations management competence, etc.
To convince techies to join as co-founders, non-technical founders should be able to convince the techie that he/she has what it takes to create value & wealth for the team.
Even in startups which are heavily dependent on technology or technology platforms, just technical competence is not sufficient for the startup to become a strong ‘business’.
Start-ups with well-rounded teams that bring complementary skills to the table are likely to have a a better chance at success. E.g. a techie + a business person + a marketing/sales person would be considered a fairly well-rounded team.