Why would you want to turn before 500 ft ?
You turn outside the protection of the surveyed splay, you put yourself in a position where people don't expect top find you - traffic inbound would look up the extended centreline to try and find you.
Whats more the pax don't normally like being treated to a thrill a minute ride.
you go and fly in an airline environment and you would not be encouraged to wander around the skies like browns cows