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Because they can't make any money if you collect them yourself...........
There is nothing wrong with IAL and they really don't cost that much and some people feel safer using the IAL because they may not know how to tell the difference in leaves or they live in an area that is polluted or pesticide are used.
I live on virgin land and we are naturalist so I am 99.9% sure in the safety of my leaves, water, bugs, dirt...etc...that I use in my tanks, if I lived in town I am not sure I would use anything I found on the ground close to a road.........
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