It'd depend on what the incentives are. If you're trying to lure a highly experienced person from a secure enterprise job to the uncertainties of a startup, what are you offering them? Money? They can make a lot more than a startup can offer by going into consulting, if they're good. Freedom? Maybe. A mission? Maybe. But you'd better have something.

For an example of other conditions... I have a friend I'd love to poach away to work for me. But he's the sole breadwinner with five young children. Besides money, I'd have to make sure I can provide good health benefits.