>> I had this exact scenario happen on the ycombinator cofounder matching of all places. Except the other cofounder (non-technical) wanted it 95/5.

I've gone to some of these just out of curiosity and it seems like people on the hunt for suckers. Having been thru this myself and seen the drama play out with friends from back in the dot-com days to now --

CO-FOUNDING IS LIKE MARRIAGE You cannot just match to someone. There has to be a low-stakes dating period, an engagement period, and then "marriage". You have to be able to walk away early on w/o extensive entanglement. The best co-founder is someone you've known for a long time in various semi-tense scenarios, where you can evaluate their ethics under pressure. This ideally means having worked together or done many projects together.

You should have countered with 95/5 in reverse, because if you can't code, nothing is getting done anyways.

Maybe, if only for the schadenfreude. But the initial offer was so bad I immediately no longer trusted them and no longer wanted to work with them.