I think that alot of experienced growers tend to want the better genetics, for instance say a grow cost you $100 nutes, you grow from bagseed and get all males...it could happen...now you have diddly...but from good genetics(I realize that you can get males even thru high dollar seed, but you are usually looking for that MOTHER) or clone or mother you know that what you grow is going to be worth it!
Clones are clones are clones...same genetics...mothers...same genetics...
most people report that if handled properly a re-veg mother will produce ever increasing better bud....that's why IMHO people put down bagseed, also alot of these growers are using medical marijuana to cope with their pain.
Now I agree that you can grow better than the bag it came from with your seeds,
but will it make your face numb like Blueberry, for instance?....just having fun...peace...latewood