If you look from investment perspective, Programs like Y Combinator and other incubators take 6-10% of the equity for $20000 seed money and mentoring. Why can a

If you look from investment perspective, Programs like Y Combinator and other incubators take 6-10% of the equity for $20000 seed money and mentoring. Why can an early developer/designer can't ask for 6-10% for working for $20k-$50k less than their market value. They are literally investing $20k+ in your company and adding value by doing work.