Well,
This subject is very interesting as we do need to conduct sponsoring and sales..
So, indeed.. we do need to advertise daily too. We need to learn how's our ads progressing. We may need to fine adjust from time to time.
Work with the worker also brings in the meaning of working with an effective advertising.
About the Buying of PSAs, this helps a lot too.. Especially when some of us has limited time due to hectic shedule in managing two duties.
Effective for newbies who just started testing their ads or if we found our ads doesnt produce a best result, so that's when Buying PSAs comes in handy.