yeah, my belief (from experiments years ago) is that the alkaloids don't seem particularly stable in a tea solution. may have been a tolerance thing, but it seemed to get weaker the longer i stored it.
no idea if it's true, but i think for HR purposes, small batches have advantages.
for one, you are less likely to consume too much, especially if it is taking a while to kick in (full effects can take hours to be felt sometimes)
also, it stops you from having it easily on-hand (makes regular/daily dosing too easily)
and if it does seem to be almost at the point of spoiling - you won't run the risk of OD by drinking it all (so none goes to waste!)
i ate way too much cannabutter once that was clearly at the point of going rancid. boy did i regret that for the next couple of days.
at least ODing on weed edibles isn't generally life threatening like opiates.