Agreed, though I imagine you need to have a response handy when the CEO mentions that part of the trade-off was that you brought home twice the salary he did du

Agreed, though I imagine you need to have a response handy when the CEO mentions that part of the trade-off was that you brought home twice the salary he did during the high-risk "will this go anywhere?" times. If he was also the primary investor to begin with, I don't imagine getting too far with the negotiation, although you certainly have significant wiggle room.