Honestly nothing. As a co-founder of a start up there is nothing any big company could do to attract me other then maybe acquiring my start up lol. I'm pretty sure this is the same for any other developer who has an entrepreneur mind set.
With that aside if I wasn't doing a start up a company would have to follow the Facebook model where they take care of all of a employee's needs for free. Make it so there is so much freedom that I'd feel like I'm work on my own terms so I'm always motivated to work as hard as I could on my task how I want to.
That's cool, like I said - it's not for everyone. Although it's worth considering that if you are successful and sell your startup to a Big Co then you'll need to "like" working there in order to see out any handcuff deal you are given.