Why so many pilots?

I have 47 ATR72-210 and 6 737-200's.

When I look in Personnel Management, it says I require:

344 Flight Crew for the ATRs

48 for the Boeing.

On top of this I require 196 Pursers and 564 flight attendants. 

Why do I need 7 pilots for each ATR if they only need 2 pilots?

Does this have something to do with the transfer of these aircraft to my home base?

Will this requirement decrease when the XFERs are done? Will I have to lay these people off or are they eliminated automatically?

You need 8 pilots per plane. I would not belive 2 pilots would work 24/7 all year round, they are actually forbide to by law.

Please do not post the same question in multiple threads.