No matter what I say to the big dwarf I don't get to fight him. another bug?

Well, it was always the case in KB that if you took low or no losses, then the money piled up quick. I'm sitting on 2 million in my Impossible Skald game (level 40) and I don't have anything like zero losses...

Yeah i cant finish that quest .
I found 2 customers and now arlania is totally empty.
Maybe later customers will reappear

Same problem here, I'm buying all the items in the game, even useless ones, and im sitting at 7mil free gold on impossible level 55...

All right, 7 mil on Impossible is waaaaay less than my 80 mil on Normal :)

I even wanted to hoard it up to 100 mil to see if there's a hidden achievement :) But only got to slightly over 80 milions, which btw is completely, biblically ridiculous.

I also found only two customers but later on the fight became possible. Maybe it unlocks only from certain level (I was almost 60 when I found out about it; same goes for the dwarf).

Question here is where is all that gold stored ? Hero goes around with army and 5 Valkyries , maybe couple of dragons flying above and probably convoy of wagons filled with gold coins. I mean, 10+ mill of gold coins, that is 1 coin = 35 grams, so 10mill = 350 tons. Holy crap, your own army would probably rebel and kill you on sleep to steal and split that fortune :-D

About attracting customers... I only found 2 in Arlania and it was before I gave this 3 artifacts to Guilford. Now I'm able to go to Riftlands and still no npc to attract in Arlania. Is it a bug or they will appear later?

If I remember correctly you wont find the last customer till a little farther down the road but not a whole lot farther. If I my memory serves me right after you give Guilford the Artifacts and you revisit Arlania and there are all new spawns you can kill most all elves but after you clear the mage tower of the undead I think they spawn another group of elves, but they are now neutral too you and there should be I think an elf archer unit that patrols right next to the portal between Arlania and Greenwort on the Arlania side and you can talk to him and send him to the bar as your third customer. I may stand to be corrected but its been almost a week since i did that quest and I just remembered I had to wait a bit after the first 2 customers. Sorry if this is incorrect but that is what I recall.