Equal split or walk away. Anything else but an equal split will create incentive problems later on, look weird when you're fundraising, and make you feel under-

Equal split or walk away. Anything else but an equal split will create incentive problems later on, look weird when you're fundraising, and make you feel under-appreciated and unhappy in case the company succeeds. Personally I think you should walk away anyway. The fact that they're trying to scam you with 5%-10% at this stage is a huge red flag in terms of culture and strategic knowledge. They either have no idea what they're doing, or they're actively trying to screw you, both of which are bad.