Help with Bitshares question

Hello everyone. So I have a question I was hoping someone could help me out with. I've been interested in Bitshares lately, and I'm still trying to figure out the whole thing (it can get confusing). I do own some Bitshares and have been exploring around the website and exchange. My question has to do with the lifetime membership they offer. What kind of user should purchase the lifetime membership? If I'm just buying to hold BTS does it make sense for me? I know it has something to do with getting paid a higher percentage of fees, but do you personally need to refer the people to get those fees or do you get some sort of a percentage from the network automatically for being a life time member? Any help would be greatly appreciated. Thanks for looking.