Male flowers produce pollen, not dope. If you want seeds, male plants are good. otherwise, even one male plant dumping pollen in an indoor growroom will pollinate every plant you have, and the free pollen will remain in the room until you clean it out thoroughly giving you random seeds for multiple grow cycles. It would be persistent like a mould infestation.
I can think of no good reason to grow a male plant unless you want seeds, or plan on cutting your shake with THC and CBD free leaf material. Believe me, if you could get anything other than pollen from a male plant nobody would remove them from their gardens.
you would have to use a huge amount of male plant foliage in a ridonkulously expensive and unprofitable alcohol extraction system to get even a tiny portion of useable cannabis extract. Im talking tons of male plant foliage and flowers and dozens of gallons of ethyl alcohol, for a two hitter of low grade hash.
