OK. I have addressed this issue a while ago. This is my take on bagseed and i defend it.
Bagseed among serious growers is pretty much looked down upon-at least by those who swear by brand name seeds. There is some good reasoning behind this. The brand name seeds do have strong genetics and the strain for the most part is stable so you know what you are getting. They were also created in a controlled environment and bred with specific traits that a grower can select and get the type of plant/bud they want. All growers of any type of plant do this. Tomatoes, flowers, peppers-you name it. There are specific breeds that people like for their situation and/or preferences.
Bagseed is a gamble. Its from unknown sources. You don't know the conditions it was grown in. And more than likely it was some sort of organized crime cartel outdoor guerilla grow that is notorious for irresponsible growing practices that tend to ruin the grow areas-or at least that's what the mainstream media would have you believe. Because its been pollinated, the THC level is decreased by up to 25%. So if a strain produces 20% THC, whether its pollinated, it could drop to 15%. Also, the seeds you get from a bag could be the child of hemp or ditch weed or a herme. You never know.
Growing brand name seeds does have its disadvantages too. First, you have to acquire them which is a dilemma. You have to order from an out of country source or smuggle them in yourself, or if you are lucky enough to have a friend who has some. There are a few states in the US where you can buy clones and make your own seeds but for most of us, that would require some traveling that is just not feasible. Many seed shops offer feminized seeds which were either treated with some sort of hormone like gibberellic acid or females were stressed to create hermes which produce female seeds-but hermes will be more susceptible to creating other herme plants. Plus the cost of the seeds, and the worry that you will even get them.
Bagseed is free and easy to come by. You can go to your buddies house and grab a few seeds from them or just look in your own bag and pick out some. Bagseed is also mystery. Since you don't know what the genetics are, you could get anything. If you get a big old sack of commercial grade weed, it was more than likely grown outdoors and is a hybrid of a hybrid. Hybrid seeds don't grow to be the mother or the father, especially if the parents were hybrids as well. Hybrid seeds are their own strain. Some may grow to be like great uncle sativa, some might end up like a distant cousin skunk or northern lights. So bagseed can potentially create an exotic variety of plants. With proper care every plant can reach its full potential and rival the bag it came from. Granted not all good genes show up and you may end up with some plants that are utter garbage, but odds are, this wont be the norm.