I don't have a problem with RP samples, I think they are effective for those who like to make use of it and such. However, in my opinion, it seems quite linear. I say this because, whenever I recruit, I like to actually role-play with the person wanting to join in Local chat. Or an In-Character session, I'll say. Yes, it's a somewhat longer process, but it's fun for both parties. The members can react to the player being recruited if they'd like or the leader of the group and the recruited player can role-play privately away from the group for the sake of their spam of other people's posts.
In addition, it helps to see if the recruited player can actually role-play as well they say they can. Anyone can make a sample post that seems legit and get accepted. Then, first thing they get in, they either are the trolls you desperately wanted to avoid in the first place or have poor creative writing that would upset your members.
To my point, I don't do role-play samples anymore, haven't for a few months and I found the alternative to actually role-playing with the players to be more interactive and story-driven. However else you view RP sampling is all up to you, we all have our ways that we find either effective for time or fun.