The lack of raid LFMs is due to Cove right now, and in all likelihood they will stay down until Mabar is over. Then they will pick back up again.
I think that you are vastly overestimating the number of people who would rather pay RL money for a tome than find it for free. Maybe after the first 20 runs, but I don't think many people will buy them right off the bat.
Also note that they are limited time only things (probably will come back, but who knows). They will not be effecting LFMs for some time to come.