Lego is a tricky one as it's obviously great. Doesn't the lego movie itself address the perils of AFoLism with Will Ferrell's (?) character, who builds his lego city with glue and won't let his kids play with it? The main problem adult fandom has actually created is that it has emboldened the Danes to push the prices of everything through the roof. I think as long as you can still enjoy it as a toy, and not as some sort of collectible you're on decent ground.