You throw some away because if you keep feeding it you will soon need a vat the size of a football stadium and half of the Australian wheat production for the next feeding (and the one after that would be impossible!)

More seriously, you don't have a healthy, established biota yet. There are probably some baddies in the mix at this time so you don't want to eat it (so no sourdough pancakes) (Would it make you sick - almost certainly not but...it might not taste very good either). You are currently striving to get the good bacteria and yeast to take over. No need to do that in a large batch which would simply waste flour and yeild a huge blob of starter.
I only maintain about a half cup of mother starter. I use about half to start my bread and feed the other half to keep it going. You don't need a lot of starter unless you are baking large batches or like to use it in pancakes and other stuff for flavor.
Glad it is working - at last!
Jay
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