Why? Why? Why? So many questions that no specific answers could sufficiently remove any doubts, much less to give any absolute answer to any one question.
What I can say, and know for certain, is that every player/gambler has own luck and preferences...something like own fate and destiny...so a million players would surely have differing tastes, likes, dislikes, and even luck, at any one casino, or with any one game provider.
However, I would surmise that most of Yggdrasil games have EXTREMELY LOW paytables...even the High Volatility games...resulting in dismally disappointing low payouts most of the time. But like I said earlier on, there would be certain players who would simply be very lucky playing Yggdrasil games, whilst most others would not. I am one of the unlucky ones...damn unlucky ones, if I may say so...so much so that I simply hate Yggdrasil games!
But then again, I can also say the same for a lot of other provider games as well...like Big Time Gaming, Push Gaming, etc, etc, etc. Somehow or rather, my luck seems to be with just a very few providers, namely Playtech, NetEnt, PlaynGo and Thunderkick. All the others would simply cut a big hole in my wallet!