Will schwag seeds produce decent plants?

[Volker]

If you try to grow with seeds picked out of a decent schwag plant, assuming you take good care of the plants and do all other factors correctly, will the seed matter very much? Like is schwag from good seeds originally, but just not grown well or something?

All my grows have been from bagseed, and all have been decent to superior produce. My current grow is my "senior project" before going on to the wazoo strain seeds.