It is normal now. It used to be that stat potions got much rarer as you dropped, so you would hang around at stat gain depth. That has been fixed in a couple of ways, so there is no longer any reason to hang around until max stat gain.
I don't recall any time in history when stat-potions have got rarer deeper, quite opposite. Just that jump in monster deadliness was much worse in old days after 2000' than it is now (dracolichs and Greater Titans etc were close to 2000' monsters)
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