...but the actual player themselves does not want to involve them.
You think its unreasonably? Don't you think its because some players are just annoying? I'm not saying about all marauders, but just about some of those who are well known :) Running around homins and all they are talking about - its pvp-pvp-pvp-pvp... Sometimes without any RP content at all. So yes, its kinda annoying ;)
And they are dont care whom to fight with. I remember when I just came from Silan in my cool green Rangers armor, with a big Fire&Wrath sword in my hand and I meet some little matis marauder. Do you know what I got from him? Yes, duel proposal. xD Im sure that player know what does Rangers Armor and F&W sword mean. And I think he know what are my levels approximately. But he just wanted to pvp, thats all. It looks kinda self-affirmation, don't you think so? ;)
So its not looks strange for me why dont other players want to play their games with maras :P
And if you will try to tell me that pvp is just a part of marauders RP - I will quote you:
Say it like it is, don't hide behind the context of RP.