I don't like the reserved LFMs, at least in regards to anything other than "quest finished, need hands in chest" situations. Personal reasons for dislike aside, I think the issue with the LFMs, is the message that is being sent to new players. Take that as you will, but I would think we can all agree in some form or another that these types of LFM posts are bad for the server, regardless of the exact reasons why.
What can we do about them? Well I would really like to see people simply not joining them, if they need the reserved or not. Secondarily try to always post another of the same raid LFM simultaneously, to provide an alternative for everyone involved.
I don't think anyone has the right to dictate loot rules for other people, but I would really hope the long-term issues of this type of LFM posts are going have can be seen by most people on the server.