@rebeccaryan,
If you have a license to plant cannabis, if you have male and female plants, I don't think you need to kill them! You can let them sex and can get their seeds! In that way you can keep growing the amount of plants you have and you can extract more oil by using it! Anyway this is just my stupid opinion! I know you have plans for them :D
Cheers~
@theguruasia, what you have stated is true. However there are pros and cons to the decision to let males live. Yes seeds will be produced but they will come with a much lower resin (or medicinal) production. The seeds won't heal, the resin will. :)