Here's the results from a Casino trip I took recently, it might be helpful to consider it:
First off I bought a grand total of 1278 High Stakes tokens. This cost me a grand total of 63,900,000 pyreals. I made 6 trips, 5 were to gamble the tokens and one last trip to gamble the Pack Dolls I had won.
In sum I received a total of:
137 Large Mnems at 75Kxp each=10,275,000xp
151 Vapor Hearts at 15Kxp each=2,265,000xp plus 151 Treated Kits, 151 Great Mana Charges, 151 GoS, and 151 Pyreal Peas. The Mana Charges were sold in Glenden Wood for 4950 pyreals each for a total of 747,450 pyreals. The Pyreal Peas were sold in Glenden Wood for 45K pyreals each for a total of 6,795,000 pyreals. I kept the gems and am in the process of trying to trade the kits.
146 Seals at 5Kxp each=730,000xp plus 7,500py each=1,095,000 pyreals
139 Jungle Wasp Wings at 5kxp each=695,000xp plus 6Kpy each=834,000 pyreals
168 Olthoi Claws at 5kxp each=840,000xp plus 134 Olthoi Sword sold to vendor in Crag for a total of 180,900 pyreals. I got kits for the other 34 and am in the process of trying to trade them
165 Shen Keys at 7,500xp each=1,237,500xp plus a D note each=8,250,000 pyreals
162 Thighbones at 7,500xp each=1,215,000xp plus a D note each=8,100,000 pyreals
160 Large Sinews at 5Kxp each=800,000xp plus 5Kpy each=800,000 pyreals
And last but not least 50 Pack dolls which themselves translated into:
23 Pyreal Peas sold for 45Kpy each in Glenden Wood for a total of 1,035,000 pyreals
7 Golden Gromnies which I am in the process of selling for 3 Sings
And 20 Golden Keys which translated mostly into a fat lot of worthless ****. I salvaged all but a few newb weapons for some of my younger toons and a couple other items, some Cov gaunts, a couple low work weapons, nothing to brag about. From the salvage I kept 247 units of Gold, 20 units of Hog, 13 units of White Sapphire, 14 units of Imp Topaz, 62 units of Steel, 15 units of Sunstone, and 26 units of Iron. The rest I sold to the vendor in Baishi, and Ayan for one 100K bag, for a total of 916,890 pyreals.
So, I spent a total of 63,900,000 pyreals
and I recouped a total of
28,754,240 pyreals
therefore I spent a total of 35,145,760 pyreals in exchange for:
151 GoS, 185 Treated Kits, 7 Golden Gromnies, 247 units of Gold, 20 units of Hog, 13 units of White Sapphire, 14 units of Imp Topaz, 62 units of Steel, 15 units of Sunstone, 26 units of Iron, a few decent items, and last but not least a grand total of:
18,057,500xp
And yeah it took ALL day. Lol
And the xp was enough to take my newb mage from 26-40.
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As you can see I spent no where near 261 mil and got 1/3 of the GG's necessary for a mansion purchase. However, you should also be able to clearly see that I got twice as many pack dolls as I should have if there's only a 2% chance per token of getting them. Also I got a couple more gromnies than I should have if there's only a 10% chance per doll of getting them. I think the first is more siginificant than the second. I very much believe that the 2% chance is wrong. I think it's at least twice that and this is not the first time I've seen it. But maybe, and don't laugh here,

maybe it's racial bias. No joke, I have also noticed in the past that whenever I take a toon to a Casino I always seem to do better if the toon I take is of the same race as the Casino owner. Probably nothing to it but it's interesting to think about.

Anyway let's break down my results and compare them to the what Maggie's has.
According to Maggie's there's a:
2% chance for a pack doll, but 3.91% of my tokens yielded a doll
6% chance for a Jungle Phyntos Wasp Wing, but 10.88% of my tokens yielded a wing
10% chance for a Large Lugian Sinew, but 12.52% of my tokens yielded a sinew
10% chance for a Shendolain Key, but 12.91% of my tokens yielded a key
12% chance for a Seal, but 11.42% of my tokens yielded a seal
14% chance for a Dark Revenant Thighbone, but 12.68% of my tokens yielded thighbone
14% chance for Large Mnemosyne, but only 10.72% of my tokens yielded a Large Mnem
16% chance for an Olthoi Claw, but 13.15%, of my tokens yielded a claw
16% chance for a Vapor Golem Heart, but only 11.82% of my tokens yielded a heart.
Also according to Maggie's for each doll there's a:
5% chance for a Tiny Shard, but I got 0
10% chance for Golden Gromnie, but I got 7, 14%
40% chance for a Golden Key and I got 20, exactly 40%
45% chance for a Pyreal Pea and I got 23 exactly 46%
It comes down to this, I think the percentages that are listed on Maggie's site for the regular items are wrong. I think it breaks down more like this:
4% chance for a pack doll
10.5% chance for a Jungle Phyntos Wasp Wing
12.5% chance for a Large Lugian Sinew
13% chance for a Shendolain Key
12% chance for a Seal
12.5% chance for a Dark Revenant Thighbone
10.5% chance for Large Mnemosyne
13% chance for an Olthoi Claw
12% chance for a Vapor Golem Heart
The percentages for the other items are probably right though.