also then what would be the advantages to keeping your mother plant if you can continue to take a clone from a clone
To maintain the original mother genetics and growing characteristics. Each time you take a clone from a mother, you're starting out with the best 'original' clone and you know exactly how that clone is going to grow and what it's going to yield and what the effect will be, as long as you grow it in the same way each time. Each time you take a clone from a clone, you may inadvertently introduce detrimental factors to it, eg you may not grow that clone as well as you did the first one, so when you take a clone from the second clone it may not be as strong as the mother the original clone came from.
Think of the clones as photocopies and the mother as the original, if you take a photocopy from a photocopy from a photocopy from a photocopy enough times the photocopy starts to degrade, if you take a photocopy from an original, the photocopy will always be as clear and accurage as the original.