Thank you all for your replies.
So i see that for mainly solo play the adventure decks are really expensive with only about 2-3 hours of play if you dont replay with multiple classes.
But ok, i still i really like the game and want to get all the content.
but the question is which ones should i get?
i current have the main games Rise of the Runelords and Skull & Shackles and both character addon packs.
I got Skull & Shackles after i heard that Runelords has very bad german translation for a lot of cards which makes everything very confusing so that you have to play with errata list.
so should i abandon Runelords and only get the adventure decks for Skull & Shackles? i also read that this version has much better rules.