As someone who outside the fandom looking in it seems like the entire 40K franchise revolves around the Space Marines, with the other factions taking a supporting role at best.
Space Marines sell the most, so they get the most frequent support. Each faction has a very loyal and very ravenous fanbase though. Generally if someone is a “space marine fan” they’re either really new, or extremely old. It’s the people that are into the Imperium factions as a whole you should look out for.
As someone who outside the fandom looking in it seems like the entire 40K franchise revolves around the Space Marines, with the other factions taking a supporting role at best.
Space Marines sell the most, so they get the most frequent support. Each faction has a very loyal and very ravenous fanbase though. Generally if someone is a “space marine fan” they’re either really new, or extremely old. It’s the people that are into the Imperium factions as a whole you should look out for.