downvoted because TOP LANE IS NOT AN ISLAND YOU SHOULD BE IGNORING ALL GAME
Downvoted because if you are a decent top laner, you shouldn't be needing ganks. Period. You should WANT their jungler to come top because it relieves so much pressure off the rest of the map.
Yeah it's frustrating if the enemy jungler keeps ganking you top... but if you are good, you shouldn't be dying... and you are making him babysit top lane while your jungler is free to dominate a lane that matters more (bottom lane) where he can have more of an impact (get 2 kills instead of 1... get dragon after)
You aren't going to see your team rushing to take out dragon after your jungler helps you kill top lane. You basically gain nothing from it other than the kill/assist gold. It's barely even worth it for the jungler to come up there... because if the enemy team is smart, they use that as the time to go take dragon since they know at least 2 of you are busy trying to kill 1 guy in top lane.