Only problem with it is when you run out most people just move on to a new dealer. Doesn't matter if you're selling the best weed in the world, if you stop having it they go else where and usually don't come back.
Your best bet is to start buying ounces and selling it to make a customer base. Then when you grow swap the bought weed for your weed. When you run out pick a few good friends you'd like to keep and phone them when you get your harvests in. Thats what I did. I went from buying ounces and smoking most of it, only putting $20 into the "pot" each time to making 200-400 every few weeks. Was always close to breaking even but never made it.
