[nradov]

To a first approximation there is no such thing as a "rockstar" developer. I mean a few of them exist, but the actual stars (not poseur wannabes) are already locked down doing other things so it isn't possible to hire them anyway. If you're hiring or building a team you have to target developers who are actually available, not the stars.

[mark-r]

Thus the need to hire junior developers. Some very small percentage of them will turn out to be rockstars, and they'll already be working for you.