It has very little to do with buying players. There is no money involved in teams like Frölunda's youth recruitment.
I would say Frölunda is a perfect storm of a few different factors that make them unique. Mostly it's about setting up the club in a way that makes it attractive for young players to come to when they are 14-15.
Historical and contemporary status as a place to be for young talent
- This goes back years, Frölunda is one of the top spots for any young talent. It's about status, the way they treat the players, how many stars they have had in their junior teams that have went on to the NHL, many young stars who break through to the SHL team.
Region that produces a lot of players
- As you say, everyone can spot a Dahlin or a Raymond but one of the main things that make Frölunda way more succesful is that they are pretty much without competition in Western Sweden (and pretty darn attractive even if they do) so players 5-15 in every age group won't be talked about but they are still very good players, so many of them will turn out as well when it's all said and done. So for this year's draft you will have your guys like Raymond, Niederbach who everyone knew and he could take his pick of what club he would like to play for at 14-15, but also local guys like Torgersson, Theo Nordlund, William Hallén and so on.
Great facilities/coaching
- They recruit heavily, they invest a lot in coaching and facilities, they take great pride in being a place to develop as a young player, and make sure to have good staff and help around the players. You can say this about most of the big clubs of course, so even though it's always a point of emphasis I would say the other two factors stand out more for Frölunda compared to other Swedish teams.