Things I brought to our startup:
- convertible note on great terms
- crappy-but-functioning prototype
- fully-designed HTML wireframes for prototype v2
- meaty customer pipeline including 2 customers pre-sold
- extensive network of sales contacts in our space
- extensive network of press contacts in our space
- 2 years experience running a site where I used and helped sell the early version of our product
I feel I bring a lot of value to our company. And I am very intent on proving that I will continue to do so. I try to justify my involvement every day. So when I talk to technical friends of mine thinking about working with someone non-technical, I tell them about the stuff I do and that they need to ask these "biz-dev" guys if they can bring stuff like that to the table.
When someone's awesome, their value-add should be clear and obvious. If you find yourself talking yourself into someone, that's a bad sign.