The better question is why are they capped at 100?
The Vex Data Seed cost 10 per weapon and by the time you have the kills for each and run the Vex Offensive, you have obtained more than enough to have replaced the 40 you initially spent.
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because for some reason bungie is now obsessed with keeping people from "hoarding" materials.
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Yep.. Don't know why they seem to have developed this obsession with hoarding and only with certain items..