I largely agree with the idea of buffing dungeon loot, but I think it needs to be more purposeful, because the majority of the reason you do dungeons (and content for that matter) in the game is to get silver so you can buy stuff.

I think dungeons should still be that, while also being an alternative way of obtaining certain resources we would otherwise spend silver on, like Caphras Stones, Cron Stones, Lightstones, etc.

This could make Dungeons more viable on the list of content we can choose to do other than grinding, like Pit of Undying and Black Shrine. 

The way I would go about buffing Dungeon loot would be something like this;

-Baseline Rewards (The physical boss loot)

  -Increase Caphras Stones per boss to 30-50(Normal) 45-65(Elvia)

  -Add 3-10 Hard / Sharp Black Crystal Shards to the boss's loot

-Maha Fragments

  -Increase Maha fragment reward count to 15(Normal), 25(Elvia)

-Vaha / Syca / Yolu Rare boxes

  -Remove Basilisk Belt, Tungrad Earring and Ring of Crescent Guardian from Vaha's Rare Box loot

   -Add Vaha's Dawn and Tungrad Belt to Vaha's Rare Box loot

  -Remove Narc's Ear Accessory from Yolu's Rare Box Loot

   -Add Eye of the Ruins Ring to Yolu's Rare Box Loot

  -Add 5-10 Maha's Fragments as a guaranteed reward to All Rare Box Loots

-Dehkima: Token of the Oath

  -Add Mythical Feathers to the exchange list at a rate of 5 Tokens per Feather (Max 5 per Week)

  -Add Caphras Stones to the exchange list at a rate of 2 Tokens per 3 Caphras 

  -Add Cron Stone x5 to the exchange list at a rate of 1 Token per 5 Cron Stones

  -Increase the exchange rate for Masses of Pure Magic from 1 Token per 2 Masses to 1 token per 3 Masses

  -Add Black Spirit Crystal to the exchange list at a rate of 25 Tokens per 1 Black Spirit Crystal

You're forgetting something, this is content that we can only do once a week, we're not supposed to only do 1b/per week for this much organization

And these 1b whether they are minimum or not they exist and that is the big problem of this dungeon

On avarage you get 2-3bil while it takes 1-2 hour to clear the dungeons! You just got unlucky, get over it...

When you personally wont be available to find players to do dungeons because no one interesting in trash drops, remember that its you personally unlucky and get over it.

I had to run last week with a random group, 'cause I couldnt join my static timewise

it took me literally 5min on the atoraxxion discord to find a party and the 6 runs took 2h and 10min in total (with a complete random group + 1 of them had several game crashes)

also 1b/h is pretty much above average for the most bdo players, not everyone is at 720gs+ and can grind Dehkia Thornwood for example, while it's possible to get through the dungeons easily with 700gs

every other grindspots average right now with yellow ls is below 1b and you most likely don't get the minimum in atoraxxion every week

only talking about EU now:
adding these many caphras would crash the caphra market even more, they're already at 2 - 2,2m (I would especially not add them to normal, there still must be a reason to do elvia on 2nd run moneywise)

adding hards/sharps wouldn't help on EU much as well, right now we got 125k Sharps at minprice sitting in the market

Maha Fragments: 
I think just doubling them would be better to balance it, that would be 10 each if you do normal runs twice (right now it's 5 each) or 20 + 16 if you do elvia twice (right now its 10 for the 1st elvia clear and 8 for the 2nd)

right now you would get 300m for normal and 540m for elvia, after that you would double it to 600m for normal and 1,08b for elvia which is already a good increase (like I mentioned above, there must still be a reason to do the 2nd run on elvia)

rare boxes:
adding vaha to vahmalkea could already work (dont add tungrad belt, gyfin is grinded a lot and there is simply no shortage of tungrad belts), I personally would only remove the basil belt there

for yolu: narc is worth more currently on EU, rather get the valtarra out of the loot table (but I personally would keep both) - instead increase the amount of fruits in the yolu box to make it more worth

for the dehkima tokens:
I totally agree with you here, it's always nice to just add stuff to exchange lists so the player can decide what he/she rather needs/wants

it would be also nice for feathers but 5 token for 1 feather would mean 40m right now, 5 tokens in memfrags would be around 30m currently on EU, I don't know how to find the correct balance there, also 2 token for 3 caphras would be 7,5-8 caphras for 5 tokens which are like 18-20m on EU, rather take the same amount as memfrags and do 1 token for 2 caphras (of course ppl on EU would rather take memfrags then moneywise, but I don't know how the prices are on other regions and if ppl there would rather take caphras)

Yeah, the value of the items being exchanged in comparison to memory fragments was something I was trying to make somewhat even, and I figured there not being a limit on Mythical feathers would in theory make getting t10s far too easy given they're really the only bottleneck nowadays