G'day Anji.
When hot at idle it will drop (20psi on my Cafe) but once over 2500rpm it's back up to 50psi.
The cam is sitting in a trough of oil so will be lubed at first rev. The bush's will be dribble fed by mist in a few seconds.
I think the oil feed to the cam is a throw back to the long stroke that didn't have the trough.
Cheers