Except that LFR dropped legendary quest items each tier. When people were progressing through tier 14, if they didn't have their Sha weapon yet where did they go? LFR. Tier 15, if a group wasn't 12/12 yet, people were in LFR for more chances at legendaries a week. Same as now up to 8/14. Why would it bother somebody who is 11/12 in ToT that they need to run LFR to maximize their potential? I wonder...