[mrvc]

Look, to be part of a startup you need to be providing value equal to your equity share. Otherwise you're leeching. If you're non-tech you can add value through getting word out, negotiating, and taking care of all non-tech business issues (legal, accounting, marketing, sales), basically things a tech is usually not very good at.

If you are not valuable equal to your equity share, reduce your equity share to a more appropriate value or GTFO.

I calculate equity split on my startups using an auction format and it just works: http://nerdr.com/hacking-the-50-50-equity-split-using-shak/