Hoarding in Amnesia

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Yeah I barely used any tinderboxes or oil either. Basically, as soon as I realized that not only was I safer from the monsters in the dark, but that also there was no real punishment for going insane I stopped using them entirely.
At first I thought that the monsters would be able to sense you while you were insane or spawn more frequently but I don't think that is the case - or is it? I didn't notice any difference in monster behaviour...