I mostly want to second some of the things that have been said by Zarzak and Aana
The game does not reward players for going back to help newer players in old content. The people who are clearing are telling you how they did it, so take their advice or don't. But i also wanted to say that while I've never sold a run, I absolutely believe it has it's place. I'm sorry, but if i have all my glamours, if i have my furniture, why should I go back to this content?! Sure, from time to time i help people just because they ask, but more often than not doing so just frustrates me. It starts like this:
They ask for my help, and instead of saying "NO i will not tank M.EX for you so i can see the fending ribbon drop for the ump-teenth time", i go ahead an go in. Then, when it's all done, when the hour(s) is/are spent and the wipes are over, what do I get?
"Laesha, is there anything I can do for you in return? Would you like this Kingly Whisker that just dropped into my inventory?" no
"Hey, you're so awesome for helping us out of the goodness of your heart. Is your FC recruiting active members?" No
or even,
"Thank you so much for your time, Laesha. You're amazing. Please let me know if you need anything fro me in the future," No ;(
They're usually too busy patting themselves on the back and ogling gear that is 10 or more ilv's lower than what they already have. Honest to god, the lack of gratitude is staggering in the VAST majority of cases. Even with all that aside, I used to help more often. Then I started having to carry around all my T5 loot so i could link every piece so fools would listen to what i had to say, for the help that they ASKED ME FOR IN THE FIRST PLACE. Then, after spending the entire fight on the floor, despite the fact that i spend more MP raising them than I do healing the raid, they have the gall to roll on the drops. I've even seen them ask members to pass so they could have it. Un-freaking-believable. I hardly consider myself elite, or even Hardcore. I'm still working on T9. But come on. This issue is FAR from one sided. I've been there. I get it. I really do. But empathy only goes so far. Opportunity cost is real, especially when even asking for genuine gratitude seems to be too much to ask. The least new players can do for themselves is keep putting up PF'ers. Maybe they'll get lucky and some nice raid leader will go in to help, see that they play well, and offer them a spot, or a sub spot. (something that's happened to me at least half a dozen times) The offer usually starts with something like "hey, are you in a permanent static?"