you said three things that I think are core to the issue. 1) You don't believe in the business model. Is that fixable? Are your co-founders similarly doubtfu

you said three things that I think are core to the issue. 1) You don't believe in the business model. Is that fixable? Are your co-founders similarly doubtful? 2) "I think my co-founders are idiots." If you actually believe that, quit. Right now. 3) "I feel as though I've invested too much time and energy to bail now." You should Google "sunk cost fallacy". If you buy stock in a company and it starts to tank, you should evaluate whether that stock with this new information is still the BEST place for your money. MANY investors don't do this-- instead, they get emotional and refuse to take a loss on a stock, hoping against hope that it'll bounce back. They should be saying, "with the information I have now, would I recommend that a friend buy the stock right now?". How much time you've invested should have NO BEARING on what you choose to do moving forward. For your happiness, wealth, or whatever other goals you have, is this company the best way to be spending your time? If you could pretend that you weren't working with these guys and they approached you to be a co-founder RIGHT NOW, would you take the gig?