I would like to buy LFR or even Tier 11-13 items in MoP without needing tokens. Just using Justice Points or whatever the new version of Justice Points are. While I understand you may want to keep people raiding in the old content for tokens for the regular difficulty tier, I am uncertain whether the LFR version of the raid will continue to be accessible.
I believe the LFR version of DS will go away in MoP making all of that gear unattainable.
I like the way a lot of gear looks from LFR and I would like to be able to buy it and re-use it for transmogrification purposes.