1st edition treasure 'hordes'
As a counterpoint to the discussion of the abundant treasure in certain published 1st edition modules, I ran through the first few monsters in the 1st edition MM and calculated the expected treasure for defeating a particular monster in its lair.
Aerial Servant: -
Ankheg: 371 cp, 300 sp, 71 ep, 25% chance of 1 gem, 11% chance of 1 piece of jewelry, 6% chance of one magic item.
Giant Ant: 3% chance of one gem, 1.6% chance of one potion
Ape, Gorilla: -
Ape, Carniverous: 260 cp, 210 sp, 50 ep, 18% chance of 1 gem, 8% chance of 1 piece of jewelry, 4% chance of 1 magic item
Axebeak: -
Baboon: -
Badger: -
Barracuda: -
Baluchitherium: -
Basilisk: 420 sp, 390 ep, 880 gp, ~2 gems, 22% chance of 1 piece of jewelry, 60% chance of 1 magic item (no weapons)
Bear: -
Beaver, Giant: -
Beetle, Giant: -
Beholder: 315 pp, ~ 6 gems, ~3 pieces of jewelry, 15% of 1 magic item, 2 potions, ~1 scroll
Black Pudding: -
Blink Dog: 130 cp, 105 sp, 25 ep, 9% chance of 1 gem, 4% of 1 piece of jewelry, 2% chance of 1 magic item
Boar: -
Brain Mole: -
Buffalo: -
Bugbear: 120 cp, 52 sp, 37 ep, 29 gp, 6% chance of 1 gem, 2.4% chance of 1 jewelry, 0.5% chance of 1 magic armor or weapon
Bullette: -
Bull: -
Camel: -
Carrion Crawler: 643 cp, 250 sp, 179 ep, 107 gp, 39% chance of 1 gem, 14% chance of 1 jewelry, 2.8% chance of 1 magic item
Catapolus: 519 cp, 294 sp, 99 ep, 35% chance of 1 gem, 20% chance of 1 jewelry, 8% chance of 1 magic item
Cattle, Wild: -
Centaur: 32 cp, 70 sp, 48 ep, 130 gp, 23 pp, ~2 gems, 29% chance of 1 jewelry, 9% chance of 1 scroll, 1% chance of 1 potion, 3% chance of 1 magic item
Centipede, Giant: -
Cerebral Parasite: -
Chimera: 420 sp, 390 ep, 880 gp, ~2 gems, 22% chance of 1 piece of jewelry, 60% chance of 1 magic item (no weapons)
Numbers aren't exact because I tended to round to the nearest whole number, but they do give you an idea of what the random treasure tables would be generating if you used them as written.
For those without prior experience, '1 magic' item refers to a randomly generated magic item - 20% would be potions and 15% would be scrolls. Scrolls and potions in the hands of intelligent creatures would be expected to be used, as would weapons in the hordes of humanoids. Although it may not be clear, the biggest bulk of the wealth by far comes from gemstones. Keep in mind the 20 sp = 1 gp exchange rate.
And of course, you wouldn't actually get the treasure in even units like that. It would come randomly in a horde so you might fight a band of monsters and get nothing and then fight another band and find 5 magic items and some jewelry. In theory, it would even out.
Looking over the table, the best 'value' on the whole table is Centaurs, who have good treasure by the book (at least by these standards) and are only 4 HD creatures with no special attacks.
It should be obvious that the random tables will not generate large hauls of magic items. If all you fought was bugbears (in thier lair!), you'd have to kill about 200 bugbear warriors and thier leaders to gain a magic weapon.